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half-life of a reaction, f/2, is the time it takes for the reactant concentration Alto ase by half. For example, after one half-life the concentration falls from the initial entration (Ale to (Ala/2. after a second half-life to Alo/4. after a third half-life -lo/8, and so on. on. For a first-order reaction, the half-life is constant. It depends only on the rate constant it and not on the reactant concentration. It is expressed as 1/2 - 1(2) 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 =Ala Part A A certain first-order reaction (A ->products) has a rate constant of 6.30x10 s at 45 °C. How long 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. ▸ View Available Hint(s) Submit Value Part B. HA ▸ View Available Hint(s) → A certain second-order reaction (B products) has a rate constant of 1.35x10 Ms at 27 °C and an initial half-life of 240 s. What is the concentration of the reactant B after one half-life? Express your answer with the appropriate units. 4 I ? Units CIF ?

half-life of a reaction, f/2, is the time it takes for the reactant concentration Alto ase by half. For example, after one half-life the concentration falls from the initial entration (Ale to (Ala/2. after a second half-life to Alo/4. after a third half-life -lo/8, and so on. on. For a first-order reaction, the half-life is constant. It depends only on the rate constant it and not on the reactant concentration. It is expressed as 1/2 - 1(2) 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 =Ala Part A A certain first-order reaction (A ->products) has a rate constant of 6.30x10 s at 45 °C. How long 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. ▸ View Available Hint(s) Submit Value Part B. HA ▸ View Available Hint(s) → A certain second-order reaction (B products) has a rate constant of 1.35x10 Ms at 27 °C and an initial half-life of 240 s. What is the concentration of the reactant B after one half-life? Express your answer with the appropriate units. 4 I ? Units CIF ?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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The half-life of a reaction, £₁/2, 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]o to [A]o/2, after a second half-life to [A]o/4, after a third half-life to [Ale/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 In(2) t1/2 = k For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as Part A 1 A certain first-order reaction (A-products) has a rate constant of 6.30x10 s¹ at 45 °C. How long 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. ▸ View Available Hint(s) CH Value Submit μA ▾ Part B HA 1 Ċ 13 Value Units A certain second-order reaction (B-products) has a rate constant of 1.35x10-3 M-¹.s¹ at 27 °C and an initial half-life of 240 s. What is the concentration of the reactant B after one half-life? Express your answer with the appropriate units. ▸ View Available Hint(s) t₁/2 =k[A]o =-1 E ? Units
Transcribed Image Text:The half-life of a reaction, £₁/2, 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]o to [A]o/2, after a second half-life to [A]o/4, after a third half-life to [Ale/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 In(2) t1/2 = k For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as Part A 1 A certain first-order reaction (A-products) has a rate constant of 6.30x10 s¹ at 45 °C. How long 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. ▸ View Available Hint(s) CH Value Submit μA ▾ Part B HA 1 Ċ 13 Value Units A certain second-order reaction (B-products) has a rate constant of 1.35x10-3 M-¹.s¹ at 27 °C and an initial half-life of 240 s. What is the concentration of the reactant B after one half-life? Express your answer with the appropriate units. ▸ View Available Hint(s) t₁/2 =k[A]o =-1 E ? Units
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