The absolute enthalpy of neutralization of the reaction,
`MgO(s)+2HCl(aq.)+H_(2)O(l)` will be

Options

A. less than `- 57.33 kJ mol^(-1)`
B. `- 57.33 kJ mol^(-1)`
C. greater than `- 57.33 kJ mol^(-1)`
D. `57.33 kJ mol^(-1)`

Answer

C

Explanation

Note that in the reactions 1 mol of `H_(2) O` is formed according to the reaction
`O^(2-) + 2H^(+) rarr H_(2)O`
Since `O^(2-)` dinegative, its interaction with `H^(+)` releases relatively more energy. Thus, the absoulte enthalpy of neutralization of `MgO` by `HCl` is greater than `- 57.33 kJ mol^(-1)`