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試卷名稱：111年 - 111 國立清華大學學士後西醫學系單獨招生考試_學士後醫學系自然科學組：化學#110532
年份：111年
科目：學士後◆化學
21. As shown in Fig, 1, a container with a frictionless movable partitions fixed volume at constant temperature is divided into three compartments (A, B, Hz and C) by two partitions, which are movable without friction. Compartments A and C are filled with an equal amount of mass of gas X and Y. When two partitions stop sliding, the density of X is equal to that of Y. Which of the following statements is correct?
(A) Volume of gas: V(X) ＞ V(H2) ＞ V(Y)
(B) Number of moles of gas: n(X) ＜n(H2) ＜n(Y)
(C) Number of moles of gas: n(X) = n(H2) = n(Y)
(D) The molecular mass of X is equal to the molecular mass of Y.
(E) The molecular mass of X is smaller than the molecular mass of Y.
