# Problem: The standard enthalpies of formation of gaseous propyne (C3H4), propylene (C3H6), and propane (C3H8) are +185.4, +20.4, and -103.8 kJ/mol, respectively.Calculate the heat evolved per mole on combustion of each substance to yield CO2(g) and H2O(g).

###### FREE Expert Solution

C3H4(g) + 4 O2(g) → 3 CO2(g) + 2 H2O(g).

ΔH˚rxn = –1849.5 kJ/mol

C3H6(g) + 9/2 O2(g) → 3 CO2(g) + 3 H2O(g).

84% (148 ratings) ###### Problem Details

The standard enthalpies of formation of gaseous propyne (C3H4), propylene (C3H6), and propane (C3H8) are +185.4, +20.4, and -103.8 kJ/mol, respectively.

Calculate the heat evolved per mole on combustion of each substance to yield CO2(g) and H2O(g).

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