Determine the Heat of Formation of Calcium Carbonate from the Thermochemical

question 2

Multiple Choice

Determine the heat of formation of calcium carbonate from the thermochemical equations given below. $\begin{array}{ll}\mathrm{Ca}(\mathrm{OH}) _{2}(s) \rightarrow \mathrm{CaO}(s) +\mathrm{H}_{2} \mathrm{O}(l) & \Delta H=65.2 \mathrm{~kJ} \\\mathrm{Ca}(\mathrm{OH}) _{2}(s) +\mathrm{CO}_{2}(g) \rightarrow \mathrm{CaCO}_{3}(s) +\mathrm{H}_{2} \mathrm{O}(l) & \Delta H=-113.2 \mathrm{~kJ} \\\mathrm{C}(s) +\mathrm{O}_{2}(g) \rightarrow \mathrm{CO}_{2}(g) & \Delta H=-393.5 \mathrm{~kJ} \\2 \mathrm{Ca}(\mathrm{s}) +\mathrm{O}_{2}(g) \rightarrow 2 \mathrm{CaO}(s) & \Delta H=-1270.2 \mathrm{~kJ}\end{array}$

• A) ?178.4 kJ
• B) ?493.2 kJ
• C) ?828.7 kJ
• D) ?980.6 kJ
• E) ?1207.0 kJ

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