13. For the vaporization of a liquid at a given pressure,
(A) △G is positive at all temperatures
(B) △G is negative at all temperatures
(C) △G is positive at low temperatures but negative at high temperatures (and zero at some temperature)
(D) △G is negative at low temperatures but positive at high temperatures (and zero at some temperature)
(E) none of above

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統計： A(0), B(0), C(10), D(0), E(0) #2740241