The rate constant of the reaction of thermal decomposition of ethyl chloride into ethylene and hydrogen chloride is 4.14*10^-5 s -1 at 700K. Calculate: a) the time for which 30% of the starting material will decompose; b) what part (%) will decompose after 10 min. after the start of the reaction; c) the activation energy of the reaction, if the pre-exponential factor is 1.3*10^10 s-1