Calculate the enthalpy of combustion of ethylene, C 2H4, at 25°C and one atmosphere pressure.
C2H4(g) + 3 O2(g) → 2 CO2(g) + 2 H2O(l)
a) -1411 kJ
b) 1254 kJ
c) -732 kJ
d) -627 kJ
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