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【单选题】
4gM 和 16.0gN 恰好完全反应,生成 0.2molX 和 10.2gY ,则 X 的摩尔质量为( )A.
28g•mol ﹣ 1
B.
84g•mol ﹣ 1
C.
56g•mol ﹣ 1
D.
112g•mol ﹣ 1
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A.
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