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答案： (B)、(D)、(E)

A: 苯
B: 甲苯

溶液中苯的莫耳分率 X_A = 1/(1 + 2) = 1/3
溶液中甲苯的莫耳分率 X_B = 2/(1 + 2) = 2/3

氣相中苯的分壓 = X_AP_A° = (1/3) × 75 = 25mmHg
氣相中甲苯的分壓 = X_BP_B° = (2/3) × 22.5 = 15mmHg
氣相的總壓力 = 25 + 15 = 40 mmHg ...... (B) 正確
...... (A) 錯誤 ...... (C) 錯誤

氣相中苯的莫耳分率 X_A' = 25/40 = 5/8 ...... (D) 正確
氣相中甲苯的莫耳分率 X_B' = 15/40 = 3/8

苯（C₆H₆）的分子量 = 12×6 + 1×6 = 78
甲苯（C₇H₈）的分子量 = 12×7 + 1×8 = 92

混合蒸氣之平均分子量 = 78×(5/8) + 92×(3/8) = 83.25 ≈ 83.2
..... (E) 正確

參考資料 土扁

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