For the first order reaction the half life can be shown written as :
t1/2 = 0.693/k
As we have given k= 2.31 x 10-3s-1
putting this value in above equation, we get
t1/2 = 0.693/2.31 x10-3s-1 = 300s
A reaction is first order in A and second order in B.
(i)
Rate constant of a reaction is equal to the rate of reaction when concentration of each of the reactant is unity.