Chemistry - Combustion

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The standard enthalpies of formation of gaseous propylene (C3H6) and propane (C3H8) are +20.4kJ/mol and -103.8 kJ/mol. Their respective combustion reactions may be written as follows, where one mole of either gas is consumed by oxyen to yield carbon dioxide and water.

Propylene:C3H6(g) + 9/2 O2 (g) = 3CO2 (g) + 3H2O(g)
Propane: C3H8(g) + 5O2(g) = 3CO2(g) + 4 H2O(g)

Calculate the heat evolved per mole on combustion of propylene(units of kJ/mol).

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