Question

1. Define half-life period of a reaction.

2. A first order reaction is found to have a rate constant k = 5.5 × 10^-14 s^-1 . Find the half-life period of the reaction.

Answer 1

1. Time in which the concentration of the reactant is reduced to one half of its initial concentration.

2. \(t_{1/2}=\frac{0.693}{k}=\frac{0.693}{5.5\times 10^{-14}s^{-1}}\)\(=\frac{0.693}{5.5}\times10^{14}s\)