Cycloalkenes and alka- dienes are structural isomers and it is observed that the isomerisation reaction of cyclo-butene into 1,3, buta-diene follows 1st order kinetics with respect to cyclobutene. The rate constant of the reaction can be determined by hydrogenting ( reaction with H_(2) to remove unsaturation) the reaction mixture and different instant and measuring the amount of hydrogen required. In one such experiment two separate glass flasks of volume 1 litres. were added with same amount of cyclobutene and sealed. While one flask was broken after 138.6 min and the contents required 39.2 ml of H_(2) gas at 1 atm pressure and 273K, where as other flask was broken after a very long time and the contents required 44.8 ml of H_(2)gas at 1 tam pressure and 273K . From the information given above and given data, anwer the questions that follows: Delta H_(f)^(@) Cyclobutene=175kJ/mol DeltaH_(f)^(@)Buta-1,3-diene =125kJ/mol The rate at which heat is released in isomerisation of cyclobutene at t=69.3 min