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The absolute enthalpy change for the reaction: MgO(s) + 2HCl(aq) → MgCl₂(aq) + H₂O(l) will be:

1. −57.33 kJ mol⁻¹
2. Greater than −57.33 kJ mol⁻¹
3. Less than −57.33 kJ mol⁻¹
4. 57.33 kJ mol⁻¹

Correct answer: Greater than −57.33 kJ mol⁻¹

Solution

The enthalpy change for the reaction will be greater than −57.33 kJ mol⁻¹ because the reaction involves the dissolution of MgO, which releases additional energy beyond the neutralization enthalpy of HCl and water.

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