Problem: The following table contains some standard enthalpies of formation, pandoc: Error at "source" (line 1, column 32): unexpected "{" expecting letter or new-line {Delta H^circ}_{ m f hspace{1 pt}}, at 298 m K.SubstanceFormulaΔH°f( m kJ/mol)Carbon dioxideCO2(g)-393.5Carbon monoxideCO(g)-110.5MethaneCH4(g)-74.80PropaneC3H8(g)-103.85WaterH2O(l)-285.8Water vaporH2O(g)-241.8You may want to reference (Pages 186 - 190) ^ Section 5.7 while completing this problem.Many portable gas heaters and grills use propane, C3H8(g).Using enthalpies of formation, calculate the quantity of heat produced when 16.0 g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.

FREE Expert Solution

We are asked to calculate the quantity of heat produced when 16.0 g of propane is completely combusted in air under standard conditions. 


Balanced reaction: 

C3H8(g) + 5 O2(g)→ 3 CO2(g) + 4 H2O(l) 


ΔH°rxn=ΔH°f, prod-ΔH°f, reactΔH°rxn=[3ΔH°f, CO2+4ΔH°f, H2O ]-[ΔH°f, C3H8+5ΔH°f,O2 ]ΔH°rxn=[3(393.5 kJ)+4(241.8 kJ )]-[(-103.85 kJ)+5(0 kJ) ]

ΔH°rxn = -2043.85 kJ/ mol C3H8


Calculate heat produced when 16.0 g of propane is completely combusted: 

Molar mass C3H8(g) = 44.11 g/mol


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Problem Details

The following table contains some standard enthalpies of formation, pandoc: Error at "source" (line 1, column 32): unexpected "{" expecting letter or new-line {Delta H^circ}_{ m f hspace{1 pt}}, at 298 m K.


SubstanceFormulaΔH°f
( m kJ/mol)
Carbon dioxideCO2(g)-393.5
Carbon monoxideCO(g)-110.5
MethaneCH4(g)-74.80
PropaneC3H8(g)-103.85
WaterH2O(l)-285.8
Water vaporH2O(g)-241.8


You may want to reference (Pages 186 - 190) ^ Section 5.7 while completing this problem.


Many portable gas heaters and grills use propane, C3H8(g).

Using enthalpies of formation, calculate the quantity of heat produced when 16.0 g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.


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