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【简答题】
炭和氧化铜的混合物55g，与适量的21%的硫酸溶液恰好完全反应，反应后滤出不溶性杂质，将所得275g滤液降温至某温度时，析出晶体25g（该温度下CuSO 4 的溶解度为25g）． （1）求混合物中氧化铜的质量分数． （2）若将等质量的混合物在密闭容器中高温灼烧，充分反应后残留的固体是什么？质量是多少？
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A.
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A.
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