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The heat of combustion of carbon and carbon monoxide are $- 393.5$ and $- 285.5 K J m o l^{- 1}$ , respectively. The heat of formation ( in KJ) of carbon monoxide per mole is

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$+ 110$

$676.5$

$- 108.5$

$- 676.5$

answer is C.

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Detailed Solution

$\underset{(S)}{C} + O_{2} \to C O_{2} Δ H = - 393.5 K J / M o l C O + \frac{1}{2} O_{2} \to C O_{2} Δ H = - 283.5 K J / M o l \underset{(S)}{C} + \frac{1}{2} O_{2} \to C O Δ H = - 393.5 + 283.5 = - 110 K J / m o l e$

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