The rate constant of a first order reaction is 15 ×10-3 s–1. How long will 5.0 g of this reactant take to reduce to 3.0 g?

Integrated rate law for 1st reaction is 0 2.303log t A kt A we can take mass of reactant So, 5 2.303log 3 kt 3 3 2.303 2.303 0.22 log5 log3 33.775 15 10 15 10 t x x x