Chemistry 30 Thermodynamics: Heat of Formation Worksheet

1.	Write heats of formation reactions for each of the following compounds. Be sure to include the energy term with the equation, either as part of the equation or separately as Δ H. You will need to refer to a Table of Thermochemical Data. CO_{2 (g)}, CuCl_{2 (g)}, CuCl_(g), N₂H_{4 (l)}, NH₄Cl_(s).
	Check your answer
	Return to Notes

2.	The standard heat of formation, ΔH^o_f, for sulfur dioxide (SO₂) is -297 kJ/mol. How many kJ of energy are given off when 25.0 g of SO_{2 (g)} is produced from its elements?

3.	The heat of reaction for the combustion of 1 mol of ethyl alcohol is -9.50 × 10² kJ: C₂H₅OH _(l) + 3 O_{2 (g)} → 2 CO_{2 (g)} + 3 H₂O _(l) + 9.5 × 10² kJ How much heat is produced when 11.5 g of alcohol is burned?

4.	ΔH for the complete combustion of 1 mol of propane is -2.22 × 10³ kJ: C₃H_{8 (g)} + 5 O_{2 (g)} → 3 CO_{2 (g)} + 4 H₂O _(l) Calculate the heat of reaction for the combustion of 33.0 g of propane.
	Check your answer
	Return to Notes

Chemistry 30