题目：
X、Y两种元素组成的两种化合物甲和乙，已知：甲的分子式为XY3，甲中X的质量分数为80%，乙中Y的质量分数为25%，则乙的分子式为( )
A．X3Y
B．XY2
C．X3Y2
D．XY4
答案：
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答案：C
X、Y两种元素组成的两种化合物甲和乙，已知：甲的分子式为XY3，甲中X的质量分数
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