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01/10/2021 12:16 pm
Topic starter
For the reaction
CO(g) + \frac{1}{2}O2(g) → CO2(g), ΔH and ΔS
are -283 kJ and -87 JK-1, respectively. It was intended to carry out this reaction at 1000, 1500, 3000 and 3500 K. At which of these temperatures would this reaction be thermodynamically spontaneous?
(a) 1500 and 3500 K
(b) 3000 and 3500 K
(c) 1000, 1500 and 3000 K
(d) 1500, 3000 and 3500 K
1 Answer
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01/10/2021 12:22 pm
Correct answer: (c) 1000, 1500 and 3000 K
Explanation:
∵ ΔG = ΔH - T x ΔS
For a spontaneous reaction, DG should be negative
ΔH = – 238 kJ, ΔS = -87 JK-1
Hence, reaction will be spontaneous when ΔH >T × ΔS.
Therefore, at 1000, 1500 and 3000 K the reaction would be spontaneous.