Given enthalpy of formation of (g) and (s) are -94.0 kJ and -152 kJ, respectively, and the enthalpy of the reaction: (s) - (s) + (g) is 42 kJ. The enthalpy of formation of (s) is

Question

Given enthalpy of formation of $CO_2$(g) and $CaO$(s) are -94.0 kJ and -152 kJ, respectively, and the enthalpy of the reaction: $CaCO_3$(s) -> $CaO$(s) + $CO_2$(g) is 42 kJ. The enthalpy of formation of $CaCO_3$(s) is

Prashant Kotian · Accepted Answer

Correct answer: D. For the decomposition reaction: (s) -> (s) + (g), δ H° = delta_f H°(, s) + delta_f H°(, g) - delta_f H°(, s). Given δ H° = 42 kJ, delta_f H°() = -94.0 kJ, delta_f H°() = -152 kJ: 42 = -152 + (-94.0) - delta_f H°(, s) => delta_f H°(, s) = -246 - 42 = -288 kJ/mol.

💡 Solution & Explanation

Practice 22,000+ questions like this