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Enthalpy of Combustion

The heat of c...

Question

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

+315 kJ

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-630 kJ

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-3.15 kJ

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-315 kJ

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Solution

The correct option is A +315 kJ
$C_{(s)} + O_{2 (g)} \to C O_{2 (g)}, Δ H = - 393.5 k J / m o l$
$\Rightarrow$ Amount of heat released in formation of $44 g C O_{2} = 393.5 k J$
$∴$ Amount of heat released on formation of $35.2 g C O_{2} = \frac{393.5}{44} \times 35.2 = 314.8 \approx 315 k J$

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