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【简答题】
黄铜是由铜、锌组成的合金．为测定某种黄铜中锌的含量，取43.4g这种黄铜和质量分数为19.6%的硫酸溶液100g恰好完全反应，将未反应的铜过滤后得到112.6g溶液． 试计算（计算结果保留1位小数） （1）合金中锌的质量分数； （2）反应后所得溶液中溶质的质量分数．
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