The enthalpy of neutralization of oxalic acid by a strong base is-25.4kcal `mol^(-1).` The enthalpy of neutralization of strong acid and strong base is–13.7 kcal `eq^(-1).` The enthalpy of dissociation of oxalic acid is:

Options

A. `1 kcal mol ^(-1)`
B. `2 kcal mol ^(-1)`
C. `18.55 kcal mol ^(-1)`
D. `11.7 kcal mol ^(-1)`

Explanation

Oxalic acid is dibasic acid hence expected heat of neutralization will be `(2 xx - 13. 7 kcal).` The dissociation energy of oxalic acid `= 2 xx 13. 7 - 25. 4 = 2 kcal mol ^(-1)`