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)
The molar heat of combustion of C2H2, carbon and hydrogen are −1300 kJ, −393.5 kJ and −282.6 kJ respectively. The enthalpy of C2H2 in kJ mol−1 is: