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

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

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

3. H2 (g) + 1/2O2 (g) → H2O (l), ΔHoC = −285 kJ

4. H2O (l) → H2O (g), ΔHoD = +44 kJ

Express your answer numerically, to four significant figures and in terms of kJ