Question

3.
If a reactant is used up according to a first order rate equation, and the initial concentration of the
reactant is 3.2 mol L", what is the concentration of the reactant after two half-lives have passed, and
after six half-lives have passed?

Answer 1

Answer:

2 half-lives=0.8

6 half-lives= 0.05

Explanation

Half-lives are constant and always decrease by half, implying that the concentration decreases by half at a consistent rate.

3.2/2= 1.6/2= 0.8 is two half-lives

3.2/2= 1.6/2= 0.8/2= 0.4/2= 0.2/2= 0.1/2=0.05 is six half-lives