Standard enthalpies of formation of CO2, H2O and C2H4 are -396 kJ/mole - 288 kJ/mole and +52 kJ/ mole respectively. Enthalpy of combustion of Ethene is

GivenCs+O2g→ CO2g;ΔH=−396kJ→1H2g+12O2g→ H2Og;ΔH=−288kJ→22Cs+2H2g→ C2H4g;ΔH=+52kJ→3RequiredC2H4g+3O2g→ 2CO2g+2H2Ol;ΔH=?2×Eq1+2Eq2−Eq3ΔH=2−396+2−288−+52=−792−576−52=−1420kJ/mole