The value of for the reaction:<br><br>is (in kcal/mol) — Thermodynamics and Thermochemistry Chemistry Question
Question
The value of $\Delta_r H$ for the reaction:<br>$\text{C}_8\text{H}_{18}\text{(l)} + \frac{17}{2} \text{O}_2\text{(g)} \to 8\text{CO(g)} + 9\text{H}_2\text{O(g)}$<br>is (in kcal/mol)
Answer: D
💡 Solution & Explanation
Calculate utilizing the provided standard formations strictly for incomplete combustion yielding CO: $\Delta_r H = 8\Delta H_f(\text{CO}) + 9\Delta H_f(\text{H}_2\text{O}) - \Delta H_f(\text{C}_8\text{H}_{18}) = 8(-26.5) + 9(-58.0) - (-74.0) = -212.0 - 522.0 + 74.0 = -660.0\text{ kcal/mol}$.
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