1- The rate constant for the decomposition of certain substance is 1.6 x 10-6s-1. C2H5C1 (g) C2H4 (g) + HCl (g) a) Determine reaction order and what is the half-life of C2H,Cl (g)? b) Calculate the time required for the concentration of C2H5C1 (g) to change from 0.165 mol/lit to 0.1 mol ? c) What is the concentration of C2H5Cl(g) after 125 hours? d) How long would it take to decompose 75% of C2H5C1 (g)? lit