試題詳解

21. Below is a phase diagram for compound X. You wish to purify a sample of X that was collected at P = 1.0 atm and T = 100 by subliming it. In order to sublime the sample, you should
(A) increase P to 1.5 atm and then increase T'to 300 K.
(B) increase T to 300 K, keeping P = 1.0 atm.
(C) lower P to 0.5 atm and then increase T to 200 K.
(D) increase T to 300 K and then lower P to 0.5 atm.
(E) abandon the attempt to sublime X.