12. When one mole of a real gas isothermally expands from 1 L to 2 L against a vacuum, which is the correct expression?
(A) q = 0 and ΔS ＞ 0
(B) w = 0 and ΔU = 0
(C) w = 0 and ΔS = 0
(D) q = 0 and ΔS = 0
(E) w = 0 and ΔS ＞ 0 

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