Given the following enthalpy changes at 25 °C and 1 atm: (1) MgO(s) + H2O(l) →…

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Given the following enthalpy changes at 25 °C and 1 atm: (1) MgO(s) + H2O(l) → Mg(OH)2(s)  ΔH = –64 kJ (2) Mg(s) + 1/2 O2(g) + H2O(l) → Mg(OH)2(s)  ΔH = –924 kJ Calculate the enthalpy change, in kJ, for the reaction Mg(s) + 1/2 O2(g) → MgO(s).

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