Thermochemistry Questions

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

$\Delta H_f^{\circ }(298\text{K})$ of methanol is given by the chemical equation:

Standard enthalpy of vapourisation ${\Delta }_{\text{vap}}{H}^{\circ }$ for water at $100^{\circ }\text{C}$ is $40.66\text{kJ/mol}$. The internal energy of vapourisation of water at $100^{\circ }\text{C}$ (in $\text{kJ/mol}$) is:

The heat of combustion of carbon to ${\text{CO}}_2$ is $-393.5\text{kJ/mol}$. The heat released upon formation of $35.2\text{g}$ of ${\text{CO}}_2$ from carbon and oxygen gas is: