The enthalpy of neutralization of oxalic acid by strong acid is `- 25.4 kcal mol^(-1)`. The enthalpy of neutralization of strong acid and strong base is `-13.7 kcal equil^(-1)`. The enthalpy of dissociation of
`H_(2)C_(2)O_(4)hArr2H^(+)+C_(2)O_(4)^(2-)` is

Options

A. `1.0 kcal mol^(-1)`
B. `2.0 kcal mol^(-1)`
C. ` 18.55 kcal mol^(-1)`
D. `11.7 kcal mol^(-1)`

Answer

B

Explanation

Enthalpy of neutralization of oxalic acid by strong base `= - 254 kcalmol^(-1) = - 12.7 kcale quiv^(-1)`
`:. `Enthalpy of dissociation of oxalic acid
`= 13.7 - 12.7 kcal e quiv^(-1)`
`=1.0 kcal e quiv^(-1) = 2.0 kcal mol^(-1)`