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Question

Calculate the enthalpy change for the reaction WO3 (s) + 3 H2 (g) → W (s) + 3 H2O (g) from the following data: 2 W (s) + 3 O2 (g) → 2 WO3 (s) ΔH = -1685.4 kJ 2 H2 (g) + O2 (g) → 2 H2O (g) ΔH = -477.84 kJ