Thermodynamics and ThermochemistrymediumMCQ SINGLE

Given enthalpy of formation of and are –94.0 kJ and –152 kJ, respectively, and the enthalpy of the rThermodynamics and Thermochemistry Chemistry Question

Question

Given enthalpy of formation of $\text{CO}_2\text{(g)}$ and $\text{CaO(s)}$ are –94.0 kJ and –152 kJ, respectively, and the enthalpy of the reaction: $\text{CaCO}_3\text{(s)} \to \text{CaO(s)} + \text{CO}_2\text{(g)}$ is 42 kJ. The enthalpy of formation of $\text{CaCO}_3\text{(s)}$ is

Answer: D

💡 Solution & Explanation

$\Delta H_{rxn} = \Delta H_f(\text{CaO}) + \Delta H_f(\text{CO}_2) - \Delta H_f(\text{CaCO}_3) \implies 42 = -152 - 94.0 - \Delta H_f(\text{CaCO}_3) \implies 42 = -246 - \Delta H_f(\text{CaCO}_3) \implies \Delta H_f(\text{CaCO}_3) = -246 - 42 = -288\text{ kJ/mol}$.

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