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Given enthalpy of formation of \( \mathrm{CO}_{2}(\mathrm{~g}) \) and \( \mathrm{CaO}(\mathrm{s}) \)
P are \( -94.0 \mathrm{KJ} \) and \( -152 \mathrm{KJ} \) respectively and the

W enthalpy of the reaction: \( \mathrm{CaCO}_{3}(\mathrm{~s}) \rightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g}) \) is \( 42 \mathrm{KJ} \).
The enthalpy of formation of \( \mathrm{CaCO}_{3}(\mathrm{~s}) \) is
(1) \( -42 \mathrm{KJ} \)
(2) \( -202 \mathrm{KJ} \)
\( (3)+202 \mathrm{KJ} \)
(4) \( -288 \mathrm{KJ} \)
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