ThermodynamicsHard

Question

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27oC is :

Options

A.35.8 J mol-1K-1
B.32.3 J mol-1K-1
C.42.3 J mol-1K-1
D.38.3 J mol-1K-1

Solution

For an ideal gas, for isothermal reversible process,
ᐃS = 2.303nR log
= ᐃS = 2.303 × 2 × 8.314 log
= 38.3 J mol-1 k-1

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