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Consider the data presented in Exercise 14.19. (a) By using appropriate graphs, determine whether the reaction is first order or second order. (b) What is the rate constant for the reaction? (c) What is the half-life for the reaction?

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Casey Durgan
Casey DurganLv2
27 May 2020

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Related questions

Consider the data presented in Exercise 14.20. (a) Determine whether the reaction is first order or second order. (b) What is the rate constant? (c) What is the half-life?

A. The half-life for a first order reaction in 49 minutes. What isthe rate constant?
B.For a second order reaction, the half-life is 726 seconds.Starting with a concentration of 0.600 M, how long will it take forthe concentration to decrease to 0.150 M?
C. The half-life for a first order reaction is 2768 years. Startingwith a concentration of 0.345 M, what will the concentration beafter 11,072 years?

D. The half-life for first order reaction A is 75 minutes. Thehalf-life for a different first order reaction B is 322 minutes.Which reaction has the faster rate? (A or B) Which reaction has thelarger rate constant, k? (A or B)

± Half-life for First and Second Order Reactions The half-life of a reaction, t1/2, is the time it takes for the reactant concentration [A] to decrease by half. For example, after one half-life the concentration falls from the initial concentration [A]0 to [A]0/2, after a second half-life to [A]0/4, after a third half-life to [A]0/8, and so on. on. For a first-order reaction, the half-life is constant. It depends only on the rate constant k and not on the reactant concentration. It is expressed as t1/2=0.693k For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as t1/2=1k[A]0

Part A) A certain first-order reaction (A→products) has a rate constant of 5.40×10−3 s−1 at 45 ∘C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration? Express your answer with the appropriate units.

Part B) A certain second-order reaction (B→products) has a rate constant of 1.15×10−3 M−1⋠s−1 at 27 ∘C and an initial half-life of 282 s . What is the concentration of the reactant B after one half-life? Express your answer with the appropriate units.

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