Question

Which of the following values would you expect for the ratio of half-lives for a reaction with starting concentrations of 0.05M and 0.01M, t1/2 (0.05M) / t1/2 (0.01M), if a reaction is known to be first order?

Answer 1

The ratio of half-lives for a reaction with starting concentrations of 0.05M and 0.01M, t1/2 (0.05M) / t1/2 (0.01M) = 1, if a reaction is known to be first order.

Step-by-step explanation:

• For a first- order reaction:

the half-life of the reaction is constant and does not depend on the value of the initial concentration.

half-life (t1/2) = 0.693/k,

where, k is the rate constant of the reaction.

So, half;life of first-order reaction is constant whatever the initial concentration.

So the ratio of t1/2 (0.05M) / t1/2 (0.01M) = 1