28. The density of compound XHn as gas is 2.393 times that of O2. If 0.01 mol of this compound reacts with excess O2, 0.36 g of water is generated. The atomic weight of element X is:
(A) 69.72 g/mol
(B) 72.55 g/mol
(C) 74.92 g/mol
(D) 78.97 g/mol
(E) 83.80 g/mol
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題目解析 本題中，給定了化合物 XHₙ...
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