試題詳解

4. Compound X, like most substances, exhibits only three phases: solid, liquid, and vapor. The triple point of X is at 90 torr and 115 ℃. Which of the following statements concerning the liquid and gaseous X is correct?
(A) X(I) cannot exist at 1 atmosphere pressure.
(B) X(I) cannot exist above 115℃.
(C) X(g) cannot exist below 115 ℃.
(D) X(I) cannot have a vapor pressure greater than 90 torr.
(E) X(l) cannot exist at a pressure of 15 torr.