Problem: Consider the reaction A → BThe rate of the reaction is 2.0 x 10 ‐2 M/s when the concentration of A is 0.31 M. Calculate the rate constant if the reaction is second order in A,  include the correct units in your answer.A) 0.0645 s‐1B) 0.208 s‐1C) 0.0062 s‐1D) 0.0645 M‐1s‐1E) 0.208 M‐1s‐1 

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We’re being asked to calculate the rate constant with the correct units for the given reaction. We can calculate the rate constant of the reaction from its rate law.


Recall that the rate law only focuses on the reactant concentrations and has a general form of:

rate law=kAxBy

k = rate constant
A & B = reactants
x & y = reactant orders


Reaction:      A → B

Given:            Order with respect to A = 2

                        Rate = 2.0x10-2 M/s

                        [A] = 0.31 M

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Problem Details

Consider the reaction A → B

The rate of the reaction is 2.0 x 10 ‐2 M/s when the concentration of A is 0.31 M. Calculate the rate constant if the reaction is second order in A,  include the correct units in your answer.

A) 0.0645 s‐1
B) 0.208 s‐1
C) 0.0062 s‐1
D) 0.0645 M‐1s‐1
E) 0.208 M‐1s‐1

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