Chemistry

Name: ___________________________

THERMOCHEMISTRY WORKSHEET #8 Heats of Formation 1.

In the refining of zinc ore, zinc sulfide is roasted according to the reaction given below. Calculate the enthalpy change for this reaction. 2 ZnS(s) + 3 O2(g) 

2 ZnO(s) + 2SO2(g)

∆Ho = ?

2.

Calculate the enthalpy change for the combustion of methane (H2O (g) is one product).

3.

Find the enthalpy change for the chemical reaction that is given for the production of iron from iron(III)oxide. 3 C(s) + 2 Fe2O3(s)  4 Fe(s) + 3 CO2(g) ∆Ho = ?

4.

Calculate the enthalpy change for the combustion of ammonia , as given by the following equation. Does your answer agree with that of question #3 on Worksheet #6? NH3(g) +

3

/2 O2(g) 

NO2(g) + H2O(g) + 1/2 H2(g)

∆Ho = ?

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