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15.4 Heats of Formation

15.4 Heats of Formation - Practice Problems Using the heats...

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Dr. Paul Moses 15.4 Heats of Formation Concept Worksheet Enthalpy can be determined from heats of formation of the reagents and products. Heat of formation is the enthalpy of the reaction of forming a compound from its elements. Consequently, the heat of formation of elements is zero. Tables of heats of formation are available and some are listed below the problems. Note that heat of formation is dependant on the state. The formula for finding enthalpy is: ∆H = (Heats of formation of products)-(heats of formation of reagents)
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Unformatted text preview: Practice Problems: Using the heats of formation below, find the enthalpy of the following reactions. a. 4 Fe (s) + 3 O 2(g) 2 Fe 2 O 3(s) b. 2 CO (g) + O 2(g) 2 CO 2(g) c. H 2 O (g) + CO (g) H 2(g) + CO 2(g) d. Ca (s) + CO 2(g) CaCO 3(s) e. CH 4(g) + 2 O 2(g) CO 2(g) + 2 H 2 O (g) Heats of Formation for selected compounds: CH 4(g)-75 KJ/mole CO (g)-110 CO 2(g)-394 H 2 O (l)-286 H 2 O (g)-242 Fe 2 O 3(s)-824 CaCO 3(s)-1207 Answers: a.-1648 KJ/mole b.-568 c.-42 d.-813 e.-891...
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