Determine the Enthalpy Change for the Decomposition of Calcium Carbonate

question 2

Multiple Choice

Determine the enthalpy change for the decomposition of calcium carbonate CaCO₃(s) ? CaO(s) + CO₂(g)
Given the thermochemical equations below.
$$\begin{array} { l l } \mathrm { Ca } ( \mathrm { OH } ) _ { 2 } ( \mathrm {~s} ) \rightarrow \mathrm { CaO } ( \mathrm { s } ) + \mathrm { H } _ { 2 } \mathrm { O } ( \ell ) & \Delta _ { r } H ^ { \circ } = 65.2 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn } \\\mathrm { Ca } ( \mathrm { OH } ) _ { 2 } ( \mathrm {~s} ) + \mathrm { CO } _ { 2 } ( \mathrm {~g} ) \rightarrow \mathrm { CaCO } _ { 3 } ( \mathrm {~s} ) + \mathrm { H } _ { 2 } \mathrm { O } ( \ell ) & \Lambda _ { r } H ^ { \circ } = - 113.8 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn } \\\mathrm { C } ( \mathrm { s } ) + \mathrm { O } _ { 2 } ( \mathrm {~g} ) \rightarrow \mathrm { CO } _ { 2 } ( \mathrm {~g} ) & \Delta _ { r } H ^ { \circ } = - 393.5 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn } \\2 \mathrm { Ca } ( s ) + \mathrm { O } _ { 2 } ( \mathrm {~g} ) \rightarrow 2 \mathrm { CaO } ( \mathrm { s } ) & \Delta _ { r } H ^ { \circ } = - 1270.2 \mathrm {~kJ} / \mathrm { mol } - \mathrm { rxn }\end{array}$$

• A) +48.6 kJ/mol-rxn
• B) +179.0 kJ/mol-rxn
• C) +345.5 kJ/mol-rxn
• D) +441.0 kJ/mol-rxn
• E) +1711.7 kJ/mol-rxn

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