Oxygen gas weighing \( 64 \mathrm{~g} \) is expanded from \( 1 \mathrm{~atm} \) to \( 0.25 \math...

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Oxygen gas weighing \( 64 \mathrm{~g} \) is expanded from \( 1 \mathrm{~atm} \) to \( 0.25 \mathrm{~atm} \) at \( 30^{\circ} \mathrm{C} \). What is the entropy change, assuming the gas to be ideal? \( (\ln 4=1.4, R=8.3 \) \( \mathrm{J} / \mathrm{K}-\mathrm{mol}) \)
(a) \( 23.24 \mathrm{~J} / \mathrm{K} \)
(b) \( 34.86 \mathrm{~J} / \mathrm{K} \)
(c) \( 46.48 \mathrm{~J} / \mathrm{K} \)
(d) \( 11.62 \mathrm{~J} / \mathrm{K} \)
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