MCQ
The heat of combustion of carbon to $CO_2$ is $ -393.5\ kJ/mol.$ The heat released upon formation of $35.2\ g$ of $CO_2$ from carbon and oxygen gas is
- A$+ 315\, kJ$
- B$- 630\, kJ$
- C$- 3.15\,kJ$
- ✓None of the above
✓
Answer
Correct option: D.
None of the above
d
Formation of $\mathrm{CO}_{2}$ from carbon and dioxygen gas can be represented as:
Formation of $\mathrm{CO}_{2}$ from carbon and dioxygen gas can be represented as:
$\mathrm{C}_{\mathrm{(s)}}+\mathrm{O}_{2(\mathrm{g})} \longrightarrow \mathrm{CO}_{2(\mathrm{g})} \quad \Delta_{f} H=-393.5 \;\mathrm{kJ}\, \mathrm{mol}^{-1}$
$(1 \text { mole }=44\, g)$
Heat released on formation of $44 \;\mathrm{g}\; \mathrm{CO}_{2}=-393.5\; \mathrm{kJ} \,\mathrm{mol}^{-1}$
Heat released on formation of $35.2\; \mathrm{g} \;\mathrm{CO}_{2}$
$=\frac{-393.5\, \mathrm{kJ}\, \mathrm{mol}^{-1}}{44 \,\mathrm{g}} \times 35.2 \;\mathrm{g}$
$=-314.8 \;\mathrm{kJ}\, \mathrm{mol}^{-1}$
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