What is the half-life of a first order reaction if time required to decrease concentration of reactant from 1.0 M to 0.25 M is 10 hours?

Step-by-step solution

For first order reaction k = 1 t A ₀ At = 1 10 1 0.25 = 4 10 ~h ⁻¹ Half-life, t _ 1 / 2 = 2 k = 2 4 / 10 = 10 2 2 2 t _ 1 / 2 =5 hour