Given the following thermochemical data at 25C and 1 atm pressure, 3/2 O2(g) + 2B(s) B2O3(s); H = -1264 kJ O3(g) + 2B(s) B2O3(s);H = -1406 kJ

Given the following thermochemical data at 25°C and 1 atm pressure,

3/2 O2(g) + 2B(s) →B2O3(s); ΔH° = -1264 kJ

O3(g) + 2B(s) → B2O3 (s); ΔH° = -1406 kJ

determine ΔH° for the following reaction at 25°C and 1 atm pressure.

3O2(g) <-> 2O3(g);