If enthalpies of formation of C2H4 (g), CO2 (g) and H2O(l) at 25 °C and 1 atm pressure are 52 , 394 and −286kJ ∕ mol respectively, the change in enthalpy for combustion of C2H4 is equal to
1
−141.2 kJ/mol
2
−1412 kJ/ mol
3
+14.2 kJ/mol
4
+1412 kJ/mol