If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentrat — Chemical Kinetics Chemistry Question

Question

If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentration of [A] was found to be half of its initial concentration. Then the rate constant of the reaction is x × 10 s . The value of x is______. (Nearest Integer) –6 –1