InterviewSolution
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InterviewSolution
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Consider the formation reactions below and pick the most stable species from the answer choices.2Cgraphite(s) + 3H2(g) → C2H6(g) ∆G◦ f = −7.86 kcal · mol−13Cgraphite(s) + 4H2(g) → C3H8(g)∆G◦ f = −5.614 kcal · mol−18Cgraphite(s) + 9H2(g) → C8H18(g)∆G◦ f = 4.14 kcal · mol−110Cgraphite(s) + 11H2(g) → C10H22(g)∆G◦ f = 8.23 kcal · mol−11. The change in entropy is large. 2. The change in entropy is small. 3. The reaction is endothermic. 4. The reaction is exothermic |
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Answer» Correct option 4. The reaction is exothermic Explanation: Since the reaction becomes more and more spontaneous as the temperature is lowered, it must be spontaneous at T = 0 K. Since ∆G = ∆H at T = 0 K, ∆H must be negative and the reaction is exothermic. |
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