Question

What is the change in enthalpy for the reaction: 2H2 + O2 → 2H2O, given the following thermochemical equations and their respective enthalpy changes: 2H2 + O2 → 2H2O, ΔH = -484 kJ/mol H2 + ½O2 → H2O, ΔH = -286 kJ/mol

Answer 1

The given reaction is:2H2 + O2  2H2OThe enthalpy change for this reaction is already provided in the first thermochemical equation:2H2 + O2  2H2O, H = -484 kJ/molSo, the change in enthalpy for the reaction is -484 kJ/mol.