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Q.

The entropy change for the reaction given below is2H2(g)+O2(g) → 2H2O(l)is … at 300 K. Standard entropies of H2(g), O2(g) and H2O(l) are 126.6, 201.20 and 68.0 JK-1 mol-1 respectively.

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a

-318.4 JK-1 mol-1

b

318.4 × JK-1 mol-1

c

31.84 × JK-1 mol-1

d

None of these

answer is A.

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Detailed Solution

∆SReaction=∑Sproduct-∑Sreactant =2 × SH2O- 2 × SH2 + SO2 =2 × 68- 2 × 126.6 + 201.20=-318.4 JK-1 mol-1

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