15. Carbon tetrachloride, CCl4, has a vapor pressure of 213 torr at 40℃ and 836 torr at 80℃. What is the normal boiling point of CCl4?
(A) 50℃
(B) 63℃
(C)88℃
(D) 81℃
(E)77℃

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統計： A(0), B(1), C(1), D(0), E(1) #2344818