Enthalpy of combustion of carbon to $C O_{2}$ is -393.5 kJ $m o l^{- 1}$ . Calculate the heat released upon formation of 35.2g of $C O_{2}$ from carbon and dioxygen gas.

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Solution

The balanced chemical reaction for the combustion of $C$ to $C O_{2}$ is given below:
$C (s) + O_{2} (g) \to C O_{2} (g); Δ H = - 393.5 k J / m o l$
The formation of 44g(1 mol) of $C O_{2}$ releases 393.5 kJ of heat.
The formation of 35.2 g of $C O_{2}$ releases $\frac{393.5 \times 35.2}{44} = 314.8 k J$ of heat.

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