x.y俩种元素,它们化合生成A和B俩种化合物.A中含X元素75%,B中含Y元素20%,已知A的化学式为XY4,则B的化学式为()
A XY3 B X2Y3 C X3Y2 D XY2
人气:494 ℃ 时间:2019-08-20 10:14:40
解答
XY4中含X元素75%,则X与Y的相对原子质量之比为12:1
B中含Y元素20%,X元素80%,X与Y质量比为4:1=12:3
X与Y的原子个数比为1:3
所以,选择A.
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