Chemistry Practice Problems Hess's Law Practice Problems Solution: Calculate the enthalpy of the reaction 4B (s) + 3O...

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Solution: Calculate the enthalpy of the reaction 4B (s) + 3O2 (g) → 2B2O3 (s) given the following pertinent information: 1. B2O3 (s) + 3H2O (g)  → 3O2 (g) + B2H6 (g), ΔH°A = +2035 kJ 2. 2B (s) + 3H2 (g) → B2H6 (g), ΔH°B = +36kJ 3. H2 (g) + 1/2O2 (g) → H2O (l), ΔH°C = -285 kJ 4. H2O (l) → H2O (g), ΔH°D = +44 kJExpress your answer with the appropriate units.

Problem

Calculate the enthalpy of the reaction 

4B (s) + 3O2 (g) → 2B2O3 (s) given the following pertinent information: 

1. B2O3 (s) + 3H2O (g)  → 3O2 (g) + B2H6 (g), ΔH°A = +2035 kJ 

2. 2B (s) + 3H2 (g) → B2H6 (g), ΔH°B = +36kJ 

3. H2 (g) + 1/2O(g) → H2O (l), ΔH°= -285 kJ 

4. H2O (l) → H2O (g), ΔH°D = +44 kJ

Express your answer with the appropriate units.

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