The standard enthalpy of combustion for solid elemental carbon oxidizing to is -393.5 kJ/mol. Determ — Thermodynamics and Thermochemistry Chemistry Question
Question
The standard enthalpy of combustion for solid elemental carbon oxidizing to $CO_2(g)$ is -393.5 kJ/mol. Determine the total heat released to the surroundings upon the complete formation of 35.2 g of $CO_2(g)$.
Answer: A
💡 Solution & Explanation
The reaction is $C(s) + O_2(g) \rightarrow CO_2(g)$ with $\Delta_c H = -393.5$ kJ/mol. The molar mass of $CO_2$ is 44 g/mol. Moles of $CO_2$ formed $= 35.2 \text{ g} / 44 \text{ g/mol} = 0.8 \text{ mol}$. The total heat released is $0.8 \text{ mol} \times 393.5 \text{ kJ/mol} = 314.8 \text{ kJ}$.
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