The heat of combustion of carbon to $C O_{2}$ is $- 393.5$ kJ/mol. The heat released upon formation of $35.2$ g of $C O_{2}$ from carbon and oxygen gas is:

- 630

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- 3.15

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- 315

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+ 315

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Solution

The correct option is D $- 315$ kJ
The molar mass of $C O_{2}$ is 44 g/mol.
35.2 g of $C O_{2}$ corresponds to
$\frac{35.2}{44} = 0.8$ moles.
The heat released upon formation of 35.2 g of $C O_{2}$ from carbon and oxygen gas is
$0.8 \times - 393.5 = - 315 k J$

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