The half-life period of a first order process is 1.6 min . It will be 90 % complete in

Step-by-step solution

For a first order reaction k= 2.303 t a a-x At half-time, aligned x & = a 2 k & = 2.303 1.6 a a- a 2 & = 2.303 1.6 2 & = 2.303 1.6 0.3010 & =0.4332 aligned For 90 % completion, aligned x & =0.9 a k & = 2.303 t a a-0.9 a 0.4332 & = 2.303 t a 0.1 a & = 2.303 t 10 & = 2.303 t 1 t & = 2.303 0.4332 & =5.3 ~min aligned