The standard heat of formation, in kcal / mol of Ba^2+ is: [Given: standard heat of formation of SO_4^2- ion ( aq )=-216 kcal / mol, standard heat of…

The standard heat of formation, in $\displaystyle \mathrm{kcal} / \mathrm{mol}$ of $\displaystyle \mathrm{Ba}^{2+}$ is : [Given : standard heat of formation of $\displaystyle \mathrm{SO}_4^{2-}$ ion $\displaystyle (\mathrm{aq})=-216 \mathrm{kcal} / \mathrm{mol}$, standard heat of crystallisation of $\displaystyle \mathrm{BaSO}_4(\mathrm{~s})=-4.5 \mathrm{kcal} / \mathrm{mol}$, standard heat of formation of $\displaystyle \mathrm{BaSO}_4(\mathrm{~s})=-349 \mathrm{kcal} / \mathrm{mol}$ ]