We’re being asked to determine the standard enthalpy change (ΔH˚rxn) for the balanced reaction:
MgO(s) + 2 HCl(g) → MgCl2(s) + H2O(l)
Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:
The ΔH˚f values given:
What is the enthalpy change for the reaction MgO(s) + 2 HCl(g) → MgCl2(s) + H2O(l) ?
The enthalpies for formation are -601.7 kJ/mol for MgO, -92.3 kJ/mol for HCl, -641.6 kJ/mol for MgCl2, and -285.8 kJ/mol for H2O.
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