In a first order reaction A B if k is rate constant and initial concentration of the reactant A is 0.5 M , then the half-life is:

Step-by-step solution

For a first order reaction. k= 2.303 t ₁₀ a a-x when t=t_ 1 / 2 k= 2.303 t_ 1 / 2 ₁₀ a a- a 2 or t_ 1 / 2 = 2.303 k ₁₀ 2= 2 k A Caution The half-life offirst order reaction is constant because the initial concentration of the reactant has no influence on the half-life of the reaction, i.e. the half-life is constant regardless of the concentration of the reactant.