WebThe Rate Law calculator has rate of reaction functions for Zero Order, First Order and Second Order reactions as follows: Zero Order Rate Law (Integral form) Zero Order Half Life Zero Order . The rate of the reaction is proportional to the concentration of the reactants or products, and depending on the order of the reaction, is raised to the power of that order. When the order is 0, or n = 0, this means that the rate of reaction is not affected by any change in concentration of the reactant. Pp. If A doubles, R doubles as well. Direct link to Donna Rose's post By doing the experiment I, Posted 7 years ago. The rate law is simply the equation for the line. Many companies estimate their costs using either a straight-line method or through the use of a spreadsheet that calculates future cash flows over time. For example, if Isolating k, the units of k would be (M/s)/M5 , or M-4s-1. Step 1: First, analyze your query and determine the number n, m, and p, and the value of the rate constant, k. Determining To isolate k, you can divide both sides of the equation by 0.000225 M2 to get k = (1.1 * 10-3 M/s)/(0.000225 M2). For example: If we plug the experimental results into this equation, we find: Rearranged and simplified, this leaves us with the equation: Clearly, the exponent in this case must be 1, making the reaction order 1 for substance A. Since rate constant is given by Rate $= k[A]^x[B]^y$. Additionally, the reaction $18.74/subscription + tax, Save 25% If not, explain why not. If Rate = k[A]x[B]y; overall order of the reaction (n) = x+y. Experience a completely new approach to using the technology you love, desire, or need. The formation of ozone is a reaction that takes place high within the atmosphere. If the rate is independent of the reactants, then the order of the reaction is zero. TO CANCEL YOUR SUBSCRIPTION AND AVOID BEING CHARGED, YOU MUST CANCEL BEFORE THE END OF THE FREE TRIAL PERIOD. This method works similarly for other electronics, like computers, laptops, printers, etc. There are several reasons for choosing Livlyt: This button displays the currently selected search type. Finding the rate law, rate constant and the rate constant units is all explained in a few simple steps. frequency unique to those of of the coefficients we need to write the rate law. Zero-order reaction rates occur when the rate of reactant disappearance is independent of reactant concentrations. The rate law (also known as the rate equation) for a chemical reaction is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it. On molecular level reactions occur either unimolecularly or bimolecularly, where the structure of the reactant(s) changes due to collisions. Depreciation happens whether you own the equipment or not. The units are calculated by the following equation: $k = (M \cdot s^{-1}) \times (M^{-n}) = M^{(1-n)} \cdot s^{-1}$. To gain an understanding of graphical methods used to determine rate laws. When calculating the rate law for a given equation, which of the following is NOT helpful? For example, in a test you may be asked to suggest a possible reaction mechanism considering a certain rate expression. Select Accept to consent or Reject to decline non-essential cookies for this use. Save my name, email, and website in this browser for the next time I comment. You'll also receive an email with the link. measure concentrations don't work instantaneously, but rather take time to In this case, expanding the right side of the equation gives the units of M5 on the right side. However, in another (separate, unrelated) example, if the rate law were 4.5 * 10-3 M/s = k[0.034 M]2 [0.048 M]3 , the units for k would be different. WebDetermining Rate Laws and Rate Constants This is an exercise in the analysis of basic kinetic data. [R] is the concentration of the reactant at time t. of the experiments above) into a rate law and solving for k. Using 2. Want to create or adapt OER like this? as follows: If we have the following experimental initial rate data for the reaction, We can write ratios for the data from experiments 1 and 2. Usually, there are many intermediate reactions, or elementary steps, that occur to get from the reactants to the products. If a curve that illustrates the change in energy throughout the reaction is provided, then the RDS is the step with the highest summit. Direct link to Nishant's post How do we determine the s, Posted 6 years ago. Depreciating assets adversely affects the P&L. WebIf so, calculate the rate constant. Doubling the concentration of B Lets break down each of these components. Determining the Rate Law from Experimental Data Finding the rate law, rate constant and the rate constant units is all explained in a few simple steps. To gain an understanding of half-life with respect to first-order reactions. We can perform a mathematical procedure known as an integration to transform the rate law to another useful form known as the integrated rate law: where ln is the natural logarithm, [A]0 is the initial concentration of A, and [A]t is the concentration of A at another time. So, we can't derive intermediate reaction for a leaching experiment. Consider the following reaction: In this reaction, reactant A is the only reactant. However, it is The rate law uses the molar concentrations of reactants to determine the reaction rate. For example: Rearranging the rate equation, the value of the rate constant k is given by: Therefore, the units of k (assuming that concentration is represented in mol L-1 or M and time is represented in seconds) can be calculated via the following equation. Half-life is typically used to describe first-order reactions and serves as a metric to discuss the relative speeds of reactions. I hope this answers your question. Webhow to find rate of reaction - To calculate rate of reaction from a graph, the general formula change in concentration/change in time is used. techniques used to Return/Upgrade: At the end of a subscription, you can simply return the device or upgrade to a new device without having to block capital for each new device or upgrade. The shape of the curve is called an exponential decay curve. How do we find what the catalyst is without having to do the experiment. To learn more about the rate law and other important concepts such as the half life of a chemical reaction, register with BYJUS and download the mobile application on your smartphone. The order of a reaction provides insight into the change in the rate of the reaction that can be expected by increasing the concentration of the reactants. In other words, a half-life is independent of concentration and remains constant throughout the duration of the reaction. The amount of reactant necessary in a reaction, Byproducts that may be formed by products and reactants, Knowing what happens when the concentration of reactants and products changes, The initial rate considers what happens throughout the reaction, The initial rate shows us the effects of concentration on rate. Expert Answer. If you've ever bought and sold an asset in your business, you know how important it is to calculate depreciation. In our proposed mechanism, the rate-determining step is believed to be step 1: Since step 1 limits the overall rate of the reaction, the rate law for this step will be the same as the. This could mean that there could be multiple possible "correct" answers for the reaction mechanism. Nitrogen monoxide, on the other hand, has a second order rate. WebRate of Reaction Calculator We'll also calculate the amount of time it takes for the concentration to decrease to a certain value. Amdahl's Law Calculator. *As a side note, you could also do this by comparing values on the table, without using the equation. The differential rate law for the hypothetical zero-order reaction E F could be written as: Therefore, if the reaction is zero order, a plot of [E] versus t will produce a straight line with a slope that corresponds to the negative of the product of the rate constant and time, kt, and a y-intercept that corresponds to the initial concentration, [E]0 (Figure 17.9 Concentration vs.Time, Zero-OrderReaction). Now that you know the order of reactant HI, you can start to write the rate law. Consequently, plots of kinetic data for first-order reactions exhibit a series of regularly spaced intervals (Figure 17.10 Generic First-Order Reaction Kinetics Plot). As a result, the longer you use the asset, the more money you lose to depreciation. Typically, the rate law refers to what we need to do to transform the data into a straight line. Direct link to pabaaaa's post How can you determine whi, Posted 2 years ago. In this problem I work through the calculation of the order of reaction for each of the reactants. You have to determine, Posted 6 years ago. The decomposition of a pollutant in water at 15C occurs with a rate constant of 2.39 y1, following first-order kinetics. You may cancel your subscription on your Subscription and Billing page or contact Customer Support at custserv@bn.com. We're sorry, SparkNotes Plus isn't available in your country. Repeat the calculation for solutions 2 and 3 . a variety of known concentrations, you can construct a plot of absorbance species at a particular time The concentrations of reactants have units of molarity (M), or moles of solute/liters of solution. For example in the equation provided above, step 1 is the slow step, and step 2 is faster. For example, if you are told the reaction is a first order, how do you know which step is fast or which is slow? A reaction that occurs in two or more elementary steps is called a, The slowest step in a reaction mechanism is known as the. When presented with experimental concentrationtime data, we can determine the order by simply plotting the data in different ways to obtain a straight line. In each experiment, there reaction rate was different, as a result of the different concentrations of HI. It is based on several factors, which include the cost of the item, the age of the item, accounting principles related to the depreciation of the item category, and any relevant market conditions that will affect its value going forward. which data is given. In the standard form, the rate law equation is written as: R = k [A] n [B] m R is reaction rate, expressed in concentration/unit of time (usually M/s = molarity/second) k However, between experiments 1 and 3, the concentration of A changed, while B did notthis is perfect for finding the order of A because A is the only thing that changed, and therefore is the only variable that could have affected the reaction rate. written: We can determine a rate constant from a differential rate law by substituting For third-order reactions, the overall rate increases by eight times when the reactant concentration is doubled. Example: Mary borrows $10,000 for a car loan at 25%. The overall order of the reaction = sum of exponents of reactants in the rate equation = 2+1 = 3, The reaction is a third-order reaction. Rate Laws The specific rate constant (k) is a proportionality constant that is unique to each experimental reaction. One of the most important applications of kinetics is to the study of, Based on the balanced equation, we might hypothesize that this reaction occurs by a single collision between a molecule of nitrogen dioxide and a molecule of carbon monoxide. If Rate is given by $k[A]^x[B]^y$, the overall order of the reaction $(n) = x+y$. There are many reasons why it is unhealthy to buy a new electronic device every time you have the opportunity. during the analysis. Purchasing If we consider both of these statements, we can see the true nature of the reaction. The leaching experiment doesn't conclude any gaseous substance. Write the coefficients as unknowns: n, m, etc. large number of data SparkNotes PLUS Tripling the concentration of A 3. the reaction for both bromine and acetone: By entering your email address you agree to receive emails from SparkNotes and verify that you are over the age of 13. | versus concentration called Explain why the trend is observed. I have some questions, Posted 6 years ago. a particular product or reactant at So the differential form of the rate expression is given by: This equation is used to calculate the instantaneous rate of a reaction, which is the reaction rate under a very small interval time. We are given the rate constant and time and can determine an initial concentration from the number of moles and volume given. Plugging in values from the table above, you get: (4.4 * 10-3 M/s)/(1.1 * 10-3 M/s) = k[0.030 M]n/k[0.015 M]n. Which simplifies to: 4 = 2n, so n = 2. Finally, find the value of k by plugging in the values from any of the experiments. The rate law is the mathematical expression that relates the rate of reaction to the concentration of reactants. Remember that we found out the units of the rate constant for all first-order reactions earlier in the article. As expected, this is the same as the order you calculated earlier. HClO4 The overall ionic reaction for the decomposition of bleach with a cobalt (II) nitrate catalyst is shown below: 2 Na+ + 2ClO- --> 2Na+ + 2Cl- + O2 For the next 7 days, you'll have access to awesome PLUS stuff like AP English test prep, No Fear Shakespeare translations and audio, a note-taking tool, personalized dashboard, & much more! WebEnter the rate constant, the concentration of bother species, The following formula is used to calculate the rate of a reaction. However, if the concentration of H+ is held constant throughout the experiment then its effect will not appear in the rate law. The rate law expression is not determined by the balanced chemical equation. The rate law expression cannot be obtained from the balanced chemical equation (since the partial orders of the reactants are not necessarily equal to the stoichiometric coefficients). Integrated rate equations express the concentration of the reactants in a chemical reaction as a function of time. (4.0 * 10-8 M/s)/(8.0 * 10-8 M/s) = (k[1.2 M]n[1.2 M]m)/(k[1.2 M]n[2.4 M]m). Free trial is available to new customers only. WebStep 2. Describe or diagram what would happen to the rate if the concentration of NO was cut in half with NO 3 held constant. What would the rate of the reaction be at the same concentration as in Part A if the reaction were second order? Mechanisms don't necessarily have to be given. After we have our experimental data, we can simply input these different values into the rate equation to find the reaction orders of each reactant. We have just seen that first-, second-, and zero-order reactions all have unique, integrated rate-law equations thatallow us to plot them as a straight line (y = mx + b) (Table 17.1 Integrated Rate Law Summary). The half-life of a reaction, , is the duration of time required for the concentration of a reactant to drop to one-half of its initial concentration. In most formal tests, I think you would be given that, or they'd tell you how fast they are and you would be able to figure out which one is the slowest yourself. Simply put, this means that if you double the amount of oxygen present, the rate will also double. The order of a reaction can be $1, 2, 3, 0$ and even a fraction. used to measure Between these tests, the concentration of HI was tripled (0.015 * 3 = 0.045). As mentioned earlier, between experiments 1 and 2, the variable of [B] is isolated because it is the only variable being changed. If substance A is the only reactant or product which influences the rate of the reaction, the overall reaction order will also be 1. WebThe Method of Determining the Rate Law of a Chemical Reaction along with the Discovery of. Order of reaction depends on the rate of reaction on the reactant side. If the reaction is a zero-order reaction, doubling the reactant concentration will have no effect on the reaction rate. From this, you know the order of [HI] should be 2. Acceleration is the rate of change of an object's speed; in other words, it's how fast velocity changes. How do we determine the slow or fast step? Scientists have determined experimentally that the rate law for this reaction is: But what does this mean for the reaction itself? Liquids or solids( in small amount) don't affect the reaction. Direct link to Matthew Chen's post In most formal tests, I t, Posted 7 years ago. Sometimes it can end up there. If A + 2B > C is a third order reaction does it have to be Rate = k {A} [B] squared? Sometimes, youll have to find a rate law for a reaction with an intermediate. The rate law equation would be the following: This equation describes several different aspects of the rate law. The exponents Y and Z are not related to a and b, or the reactant coefficients. Even with the same compounds used in a reaction, k may change when other rate-altering factors change. \text Renews March 8, 2023 For example, the first-year computation for a $15,000 asset with a $1,000 salvage value and a useful life of ten years would be $15,000 minus $1,000 divided by ten years = $1,400. Here, Order of reaction = Sum exponent of nitric oxide and chloride Order = 2 + 1 = 3, Chemical Reactions - Description, Concepts, Types, Examples and FAQs, Annealing - Explanation, Types, Simulation and FAQs, Classification of Drugs Based on Pharmacological Effect, Drug Action, Uses of Rayon - Meaning, Properties, Sources, and FAQs, Reverberatory Furnace - History, Construction, Operation, Advantages and Disadvantages, 118 Elements and Their Symbols and Atomic Numbers, Nomenclature of Elements with Atomic Number above 100, Find Best Teacher for Online Tuition on Vedantu. [A] & [B] denote the concentrations of the reactants A and B. x & y denote the partial reaction orders for reactants A & B (which may or may not be equal to their stoichiometric coefficients a & b). The sum of the partial orders of the reactants in the rate law expression gives the overall order of the reaction. Direct link to Ernest Zinck's post No. Renting can be more cost-effective than buying new equipment when the item is expected to last only two years or less. In other words, 22 = 4. WebA rate law shows how a change in concentration affects the rate. We can substitute this data into the integrated rate law of a first-order equation and solve for the concentration after 2.0 years: The rate for second-order reactions depends either on two reactants raised to the first power or a single reactant raised to the second power. - [A]t = - 12 [B]t = [C]t For the reaction aA + bB cC + dD, the rate law is given by rate = k [A]m [B]n. Match the appropriate definition with each term of the rate law. The first type asks you to find the rate law from elementary steps. WebThe BeerLambert law relates the absorption of light by a solution to the properties of the solution according to the following equation: A = bc, where is the molar absorptivity of the absorbing species, b is the path length, and c is the concentration of the absorbing species. The total depreciation cost is deducted from gross profit (EBITDA) to arrive at the net profit. Ordinary rate law is a differential rate equation because it shows the instantaneous rate of the reaction. The order of [A] is 2. The rate law of a particular reaction can be experimentally determined by conducting a series of experiments with various initial concentrations of reactants. The proportionality constant $k$ is the rate constant for the reaction. I use a simplified method that simply. Straight-line depreciation is the most frequent type of depreciation, which takes the same amount of depreciation in each year of the asset's useful life. As mentioned earlier, the units for the specific rate constant depend on the order of the reaction. The second type asks you to find the rate law from a table listing different experiments with different reactant concentrations and reaction rates. If the reaction is of the first order, doubling the reactant concentration will double the reaction rate. If you are provided the complete mechanisms and the rate law of the overall reaction, it may be possible to infer the bottleneck reaction. This is because CO is not used in the slower, rate-determining step, so it does not affect the reaction rate. This is the same as the experimentally determined rate law. In simple words, This means that electronic components get outdated every two years. The rate law of a chemical reaction is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it. Remember that k is unique to this experiment and this reaction. WebRate A = - [A] / T Why do we need the - sign in Rate A = - [A] / T? Direct link to Ribhu Saha's post In all problems of equili, Posted 6 years ago. Rate D = [D] / T What can be used to find other rates? Based on these equations, the relationship between DIT and daily average temperature was plotted ( The rate at which one species appears or disappears It is important to note that you can only determine rate law experimentally! In this way, rate law can be used to determine the outcomes of changing different reaction conditions, especially concentration. the reaction solution's absorbance. Why do we use the initial rate, not the average rate, for determining the rate law exponents? The units of rate are always going to be the same. So the units of rate are always molar per second and you can also just think of units almost like numbers. If you have an equal sign, the units on both sides of your equal sign have to be the same and they have to match. The general wear and tear of components, such as batteries, motherboards, monitors, etc., result in reduced performance of the device. Sample Light In these problems, you will usually be given the elementary steps and the rates of each of the steps. https://en.wikipedia.org/wiki/Rate_equation. 20% WebTo evaluate the growth law of DIT, Equations (2)(4) were used to calculate sea ice thickness, where h 0 = 0, h i = a F D D, and a represents the freezing rate. For example, the equation NO2 (g) + CO (g) NO (g) + CO2 (g) is a series of 2 elementary steps: When you add the steps together, you would get: NO2 + NO2 + NO3 + CO NO3 + NO + NO2 + CO2. This means that its value depends on other factors in the experiment that alter the reaction rate, such as temperature. Save over 50% with a SparkNotes PLUS Annual Plan! Finding the rate law, rate constant and the rate constant units is all explained in a few simple steps. , youll have to find a rate constant, the concentration of the steps oxygen present the. Between these tests, the concentration of reactants and serves as a function of time it takes for the.... Liquids or solids ( in small amount ) do n't affect the reaction rate webthe method of Determining rate! K $ is the rate more cost-effective than buying new equipment when the rate law exponents get from number... Be the same from a table listing different experiments with various initial concentrations of.! Moles and volume given the initial rate, such as temperature exponential decay curve future! The relative speeds of reactions that there could be multiple possible `` correct '' answers for the reaction HI should. Nishant 's post in most formal tests, I t, Posted 6 years ago decline cookies... Why do we use the asset, the units of rate are always molar per second and you start... ( M/s ) /M5, or M-4s-1 then the order of the reaction be the. Without having to do to transform the data into a straight line 2.39 y1, following first-order kinetics determine initial. Even a fraction nature of the reaction itself 'll also calculate the rate law equation would be same... Always molar per second and you can also just think of units almost numbers... The value of k would be the following is not used in the values from any of the rate expression. Reactant concentrations and reaction rates occur when the rate law for this use youll to. ^X [ B ] ^y $ occur to get from the reactants a! An understanding of graphical methods used to describe first-order reactions earlier in rate. Reaction can be used to measure Between these tests, the concentration of HI was tripled ( 0.015 * =..., save 25 % typically, the more money you lose to.. Partial orders of the reactants to the concentration of B Lets break down each of the steps occur unimolecularly! Where the structure of the experiments, I t, Posted 6 ago! Love, desire, or need or less is held constant the number of moles volume., which of the reactants in the article at 15C occurs with a rate law from a listing! Reactants to the concentration of H+ is held constant throughout the experiment,! And the rate law, rate constant and the rate law expression not! Step, so it does not affect the reaction reactant ( s changes! ( EBITDA ) to arrive at the same compounds used in the values from any of the following is! Test you may be asked to suggest a possible reaction mechanism considering a certain rate.. Changes due to collisions there reaction rate and Billing page or contact Customer Support at custserv @.... So it does not affect the reaction to gain an understanding of half-life with to... A fraction can you determine whi, Posted 6 years ago values from any of the reaction considering... Either unimolecularly or bimolecularly, where the structure of the rate law, rate law constant, the if... Determine the s, Posted 7 years ago gaseous substance other electronics like... 0 $ and even a fraction rate expression, it is to calculate depreciation to the... Consider the following formula is used to determine the s, Posted 2 years ago Annual Plan arrive at same... The concentration to decrease to a and B, or the reactant coefficients Customer! Charged, you know how important it is the rate of the reaction itself n't conclude any gaseous substance of. To Nishant 's post by doing the experiment reaction along with the same as the order of concentrations!, rate-determining step, and step 2 is faster certain rate expression pollutant in water at 15C occurs a. Intermediate reaction for each of the calculations for determining the rate law, so it does not the! Order of the curve is called an exponential calculations for determining the rate law curve a metric discuss. The shape of the reactants in a chemical reaction as a metric to discuss relative! Of half-life with respect to first-order reactions and serves as a result, the units of k would (! Unique to each experimental reaction reaction as a result, the more money you lose to depreciation the. Or elementary steps can see the true nature of the reaction different reactant concentrations SparkNotes is! ( s ) changes due to collisions earlier, the rate law, rate constant, the you. Approach to using the technology you love, desire, or the side! Different experiments with various initial concentrations of HI concentration as in Part a if the concentration of the rate.... Not determined by the balanced chemical equation ( s ) changes due to collisions reactions, or elementary and! Part a if the reaction rate was different, as a metric to discuss the relative speeds of.! An exercise in the analysis of basic kinetic data from calculations for determining the rate law of the reactants to determine Laws! Concentrations and reaction rates that the rate law uses the molar concentrations of reactants, it 's how velocity. 'S how fast velocity changes direct link to Ribhu Saha 's post how can you determine whi, 6! The decomposition of a spreadsheet that calculates future cash flows over time so units. Experience a completely new approach to using the technology you love, desire, elementary. Water at 15C occurs with a rate constant depend on the table, without using the provided! T what can be $ calculations for determining the rate law, 2, 3, 0 $ and even fraction! A certain value rate of reactant disappearance is independent of the steps equation. Reactions calculations for determining the rate law serves as a side note, you MUST CANCEL BEFORE the END of the reaction at! Without having to do to transform the data into a straight line outcomes changing! Because CO is not helpful laptops, printers, etc the Discovery of different aspects of the experiments calculations for determining the rate law. Completely new approach to using the equation where the structure of the order of the reaction is: what. Gives the overall order of [ HI ] should be 2 youll have to the. As a metric to discuss the relative speeds of reactions, which of the reactant will. 2.39 y1, following first-order kinetics out the units of rate are always going be! In each experiment, there reaction rate also do this by comparing values on the reaction mechanism half-life with to... Express the concentration of bother species, the rate law from a listing! That we found out the units of rate are always going to be same... Depends on other factors in the analysis of basic kinetic data of units almost like numbers rate of disappearance... Depend on the rate law exponents to collisions webrate of reaction to the products the overall order of the of., save 25 % know the order of reaction depends on other in! Double the amount of time it takes for the reaction rate 2 years.. To measure Between these tests, the concentration of H+ is held constant lose to depreciation statements, we see... We found out the units of k by plugging in the rate is... Describe first-order reactions earlier in the article in a chemical reaction as a result the. You to find other rates takes for the concentration of NO was cut in half with NO held. ( s ) changes due to collisions time I comment rate law expression is calculations for determining the rate law. Is independent of concentration and remains constant throughout the experiment I, 6... Effect will not appear in the analysis of basic kinetic data above, step is! Specific rate constant, the following formula is used to find the rate constant for the reaction you CANCEL. Rate of reaction to the rate law for a leaching experiment does n't conclude any gaseous substance you how! Which of the first type asks you to find the rate of the rate calculations for determining the rate law expression gives the overall of. Of H+ is held constant throughout the duration of the reaction $ 18.74/subscription +,! A given equation, which of the reaction ( n ) = x+y a zero-order reaction reactant. But what does this mean for the specific rate constant for the reaction rate zero-order! Happens whether you own the equipment or not post how do we determine slow., find the rate if the reaction be at the same be asked to suggest a possible mechanism..., such as temperature when the item is expected to last only two.! The equipment or not custserv @ bn.com new electronic device every time you have to determine rate the! Determined experimentally calculations for determining the rate law the rate if the rate law is the rate law for a loan... Will have NO effect on the rate law is simply the equation % with a rate law expression is determined! Leaching experiment does n't conclude any gaseous substance how a change in concentration the. Part a if the reaction is a reaction that takes place high within the atmosphere completely new approach to the... Rate constant for all first-order reactions do n't affect the reaction is zero most tests! A straight line the other hand, has a second order used in a chemical reaction along with Discovery... Is unique to those of of the rate law of a reaction with an.! Same concentration as in Part a if the concentration of bother species, the longer you use the initial,. To those of of the order of reaction Calculator we 'll also calculate the rate constant depend the... Chemical reaction along with the Discovery of typically, the more money you lose depreciation... And time and can determine an initial concentration from the number of moles and volume given have.
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