Determine the Standard Enthalpy of Formation of Calcium Carbonate from the Thermochemical

question 23

Multiple Choice

Determine the standard enthalpy of formation of calcium carbonate from the thermochemical equations given below. $$\begin{array} { l l } \mathrm { Ca } ( \mathrm { OH } ) _ { 2 } ( \mathrm {~s} ) \rightarrow \mathrm { CaO } ( \mathrm { s } ) + \mathrm { H } _ { 2 } \mathrm { O } ( \ell ) & \Delta _ { r } H ^ { \circ } = 65.2 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn } \\\mathrm { Ca } ( \mathrm { OH } ) _ { 2 } ( \mathrm {~s} ) + \mathrm { CO } _ { 2 } ( \mathrm {~g} ) \rightarrow \mathrm { CaCO } _ { 3 } ( \mathrm {~s} ) + \mathrm { H } _ { 2 } \mathrm { O } ( \ell ) & \Delta _ { r } H ^ { \circ } = - 113.8 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn } \\\mathrm { C } ( \mathrm { s } ) + \mathrm { O } _ { 2 } ( \mathrm {~g} ) \rightarrow \mathrm { CO } _ { 2 } ( \mathrm {~g} ) & \Delta _ { r } H ^ { \circ } = - 393.5 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn } \\2 \mathrm { Ca } ( \mathrm { s } ) + \mathrm { O } _ { 2 } ( \mathrm {~g} ) \rightarrow 2 \mathrm { CaO } ( \mathrm { s } ) & \Delta _ { r } H ^ { \circ } = - 1270.2 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn }\end{array}$$

• A) ?1712.3 kJ/mol-rxn
• B) ?441.8 kJ/mol-rxn
• C) ?849.6 kJ/mol-rxn
• D) ?980.6 kJ/mol-rxn
• E) ?1207.6 kJ/mol-rxn

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