Oxygen gas weighing 64 g is expanded from 1 atm to 0.25 atm at 30°C. What is the entropy change, ass — Thermodynamics and Thermochemistry Chemistry Question
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)
Answer: A
💡 Solution & Explanation
Moles of $O_2$ n = 64 / 32 = 2 mol. Isothermal expansion: Δ S = n * R * ln(P1/P2) = 2 * 8.3 * ln(1 / 0.25) = 2 * 8.3 * ln 4 = 2 * 8.3 * 1.4 = 23.24 J/K.
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