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

`H_(2)C_(2)O_(4) hArr 2H^(+) + C_(2)O_(4)^(2-) , Delta H_(1)= Q and 2H^(+) + C_(2)O_(4)^(2-) + 2Na^(+) + 2OH^(-) rarr 2Na^(+)+ C_(2)O_(4)^(2-) + 2H_(2)O_((l)), Delta H_(2)= -13.7 xx 2`
Adding both `H_(2)C_(2)O_(4) + Na^(+) + OH^(-) hArr Na^(+) + C_(2)O_(4)^(2-) + H_(2)O Delta H_(3)= -25.4` kcal
So, `Q - 13.7 xx 2 = -25.4` kcal