Using Hess's law,what is ΔH°_rxn for the following reaction? WO₃(s) + 3H₂(g) → W(s) + 3H₂O(g)
2W(s) + 3O₂(g) →2WO₃(s) ΔH°_rxn = -1685.8 kJ/mol
2H₂(g) + O₂(g) → 2H₂O(g) ΔH°_rxn = -483.6 kJ/mol

Question

Quizplus · Accepted Answer

To find ΔH° for WO₃(s) + 3H₂(g) → W(s) + 3H₂O(g), reverse the first reaction and divide by 2, then add it to 3 times the second reaction. This gives ΔH° = (1685.8/2) + 3*(-483.6/2) = 117.5 kJ/mol.

Using Hess's Law,what Is ΔH°rxn for the Following Reaction? WO3(s)

Using Hess's Law,what Is ΔH°_rxn for the Following Reaction? WO₃(s)