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 kJ
Express your answer with the appropriate units.
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