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A + B →C + D ; ΔH = – 10,000 J mol–1 , ΔS = – 33.3 J mol–1 K–1(i) At what temperature the reaction will occur spontaneously from left to right ? (ii) At what temperature, the reaction will reverse? |
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Answer» ΔG = ΔH – TΔS At equilibriu, ΔG = 0 so that ΔH = TΔS or T = ΔH/ΔS = -1000 mol-1/-33.3JK-1 mol-1 = 300.03 K (i) For spontaneity from left to right. G should be –ve for the given reaction. This will be so if T < 300.3 K (ii) For reverse reaction to occur, G should be +ve forward reaction. This will be so if T > 300.3 K. |
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