Question

The initial concentration of A in the first order reaction A→3B+2C is 0.535 mol L−1. Given that the rate constant is 0.450 s−1, what is the half-life of the reaction, in seconds? Remember to use correct significant figures in your answer (round your answer to the nearest hundredth).

Answer 1

Half life = 1.540 s

Step-by-step explanation:

A → 3B+2C

Initial concentration = 0.535 mol L−1

rate constant k = 0.450 s-1

half life t1/2 = ?

Since the reaction s a first order reaction

Half life is given by;

t1/2 = 0.693 / k

t1/2 = 0.693 / 0.450 = 1.540 s