Chemistry Practice Problems Enthalpy of Formation Practice Problems Solution: Consider the following reaction. 2Fe2O3 → 4Fe + 3O...

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Solution: Consider the following reaction. 2Fe2O3 → 4Fe + 3O2     ΔH°rxn = + 824.2 kJ The decomposition of 33.0 g of Fe2O3 results in (a) the release of 85.2 kJ of heat. (b) the release of 1.70 x 102 kJ of heat. (c) the absorption of 85.2 kJ of heat. (d) the absorption of 1.70 x 102 kJ of heat. (e) the absorption of 13600 kJ of heat. (f) the release of 13600 kJ of heat.

Problem

Consider the following reaction. 

2Fe2O3 → 4Fe + 3O2     ΔH°rxn = + 824.2 kJ 

The decomposition of 33.0 g of Fe2O3 results in 

(a) the release of 85.2 kJ of heat. 

(b) the release of 1.70 x 102 kJ of heat. 

(c) the absorption of 85.2 kJ of heat. 

(d) the absorption of 1.70 x 102 kJ of heat. 

(e) the absorption of 13600 kJ of heat. 

(f) the release of 13600 kJ of heat.


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