The rate constant for a zero order reaction is 2 × 10–2 mol L–1 sec–1. If the concentration of the reactant after 25 sec is 0.5 M, the initial concentration must have been

Integrated rate law for zero order reaction is 0 t A - A = kt -2 -1 -1 k = 2 × 10 mole L sec >> t = 25 sec t A = 0.5 M 0 t A = kt + A 2 2 10 25 0.5 x x 0.5 0.5 1 M