The rate constant of the reaction, A→B is 0.6×10−3 mole per second. If the concentration of A is 5 M then concentration of B after 20 min is

Key concept For a zero order reaction unit of rate constant is (mol L-1 s-1 ). Hence, we can easily calculate concentration of B after 20 min by the following formula, X=kt=0.6×10−3×20×60=0.72M