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Question

When 1 mole of an ideal gas at 20 atm pressure and 15 L volume expands such that the final pressure becomes 10 atm and the final volume becomes 60 L. Calculate entropy change for the process. (Cp.m.=30.96Kmole1K1)

A
80.2J.k1mol1
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B
62.42kJ.k1mol1
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C
120×102J.k1mol1
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D
27.22J.k1mol1
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Solution

The correct option is D 27.22J.k1mol1
P1V1T1=P2V2T2 (Ideal gas law)
T2T1=63
ΔS=2.303×n{Cplog10T2T1+Rlog10P1P2}
ΔS=2.303×1{30.96log1063+Rlog102010}
ΔS=27.22J.k1mol1

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