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Consider the following reactions
P \( \mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{X} \mathrm{kJ} \)

W \( \mathrm{CO}(\mathrm{g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{YkJ} \) The heat of formation of \( \mathrm{CO}(\mathrm{g}) \) is
(1) \( -(\mathrm{X}+\mathrm{Y}) \mathrm{kJ} / \mathrm{mol}(2) \quad(\mathrm{X}-\mathrm{Y}) \mathrm{kJ} / \mathrm{mol} \)
(3) \( (\mathrm{Y}-\mathrm{X}) \mathrm{kJ} / \mathrm{mol} \)
(4) \( (\mathrm{Y}+\mathrm{X}) \mathrm{kJ} / \mathrm{mol} \)
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