ThermodynamicsMedium
Question
Oxygen gas weighing 64 g is expanded from 1 atm to 0.25 atm at 30°C. What is the entropy change, assuming the gas to be ideal? (ln 4 = 1.4, R = 8.3 J/K-mol)
Options
A.23.24 J/K
B.34.86 J/K
C.46.48 J/K
D.11.62 J/K
Solution
$\Delta S = nR.\ln\frac{P_{1}}{P_{2}} = \frac{64}{32} \times 8.3 \times \ln\frac{1}{0.25} = 23.24\text{ J/K}$
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