现有Na2CO3和NaOH组成的固体混合物9.3克与50克稀盐酸恰好完全反应，产生二氧化碳2.2克，求：
(1)原固体混合物中Na2CO3的质量;
(2)反应后所得溶液的溶质的质量分数?
解：（1）
106 117 44
x y 2.2
解得x=5.3(g) y=5.85(g)
（2）
40 58.5
9.3-5.3 z
解得z=5.85(g)
∴NaCl的质量分数=
答：（1）原固体混合物中
的质量为5.3g
（2）反应后所得溶液的溶质的质量分数为20.49％
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