Question

Which of following statement is correct?

a. The half life of first order reaction is independent of the initial concentrations of the reactants

b. The half-life of a first order and zero order reaction are both always independent of the initial concentrations of the reactants

c. The half-life of a zero order reaction is independent of the initial concentration of the reactants.

d. The half-life of a first order reaction is always dependent of the initial concentrations of the reactants

I need help!!!!!

Answer 1

The half time of zero order of reaction is following:

t1/2=[A]o/ 2k

For zero-order reactions, the half-life depends on the initial concentration of reactant and the rate constant.

The half time of firstorder of reaction is following:

t1/2=ln2/ k≈ 0.693/ k

This indicates that the half-life of a first-order reaction is a constant and not depending on the initial concentration.

Hence the correct answer is a. The half life of first order reaction is independent of the initial concentrations of the reactants