Question

A substance reacts according to the first order rate law and the specific reaction rate for the reaction is 1 x 10^-2 s^-1 . If the initial concentration is 1.0 M. 

1. What is the initial rate? 

2. What is the reaction rate after 1 minute?

Answer 1

1. Initial rate of a first order reaction 

= k C 

= 1 x 10^-2 x 1.0

 = 1 x 10^-2mol L^-1 s^-1 

2. Concentration after 60 seconds is calculated by applying the first order kinetic equation,

Rate of reaction after 1 minute

 = k x C 

= 1x 10^-2 x 0.5489

5.489 x 10^-3 mol L^-1 s^-1