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The enthalpy of neutralisation of oxalic acid by strong base is 25.4 kcal/mol. The enthalpy of neutralisation of strong acid and strong base is -13.7 kcal/equil. The enthalpy of dissociation of $H_2C_2O_4 \leftrightharpoons 2H^+ + C_2O_4^{2-}$ is


(a) 1.0 kcal/mol
(b) 2.0 kcal/mol
(c) 18.55 kcal/mol
(d) 11.7 kcal/mol

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A)
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Answer: 2.0 kcal/mol
Enthalpy of dissociation of oxalic acid = Heat of neutralisation of a strong acid with a strong base - Heat of neutralisation of oxalic acid with a strong base
= - 25.4 kcal/mol - ( - 2 $\times$ 13.7 kcal/mol)
= - 2.0 kcal/mol
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