A) The reactant concentration in a zero-order reaction was 9.00×102 M after 155

Question

A) The reactant concentration in a zero-order reaction was 9.00×102 M after 155 s and 2.00×102 M after 365 s . What is the rate constant for this reaction? B) What was the initial reactant concentration for the reaction described in Part A? C) The reactant concentration in a first-order reaction was 9.80×102 M after 15.0 s and 6.30×103 M after 100 s . What is the rate constant for this reaction? D) The reactant concentration in a second-order reaction was 0.630 M after 120 s and 3.70×102 M after 850 s . What is the rate constant for this reaction?

Explanation / Answer

rate equation for zero order reaction

[A] = [A0] -Kt

0.02 = 0.09 - kx210

k = 0.07 / 210

k = 3.33 x 10-4 M/s

partB

use the again same equation

0.09 = [A0] - 0.00033

[A0] = 0.09033

or 9.033 x 10-2 M

Part C

rate equation

k = 2.303 / t log[A0/A]

= 2.303 / 85 log [0.098/0.0063]

= 0.0323 s-1

part D

rate equation

1/[A] = kt + 1/[A0]

1/ 0.037 = k x 730 + 1/ 0.63

27.03 = k x 730 + 1.6

k = 0.0348 M-1s-1

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