Be sure to answer all parts.
Calculate the heats of combustion for the following reactions. Use the standard enthalpies of formation.
(a) C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (l) kJ/mol
(b) 2H2S (g) + 3O2 (g) → 2H2O (l) + 2SO2 (g) kJ/mol
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