The heat of the combustion of graphite and carbon monoxide respectively are 393.5 kJ mol1 and 283 kJ mol $^{- 1}$ . Thus heat of formation of carbon monoxide in kJ mol $^{- 1}$ is:

- 110.5

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+ 110.5

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- 55.25

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None of these

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Solution

The correct option is B $+ 110.5$

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