Standard enthalpy of vaporisation ∆vap H° for water at 100°C is 40 .,66kj /mol. Internal energy of vaporisation of water at 100°C is
Standard enthalpy of combustion of CH4 is −890 kJ mol−1 and standard enthalpy of vaporisation of water is 40.5 kJ mol−1. Calculate the enthalpy change for the reaction : CH4(g)+2O2(g)→CO2(g)+2H2O(g)