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Given that \( \mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}, \Delta H^{\circ}=-x \mathrm{~kJ} \) \( 2 \mathrm{CO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CO}_{2}, \Delta H^{\circ}=-y \mathrm{~kJ} \)
The enthalpy of formation of carbon monoxide will
\( \mathrm{P} \) be
(a) \( \frac{y-2 x}{2} \)
(b) \( 2 x-y \)
(c) \( y-2 x \)
(d) \( \frac{2 x-y}{2} \)
(1997)
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