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【简答题】
为测定大理石含CaCO 3 的质量分数，取大理石12．5g，加入100g稀盐酸的烧杯中，两者恰好完全反应（假设其他杂质不与盐酸反应，也不溶解），将反应后所得气体通入到足量的澄清的石灰水中，得到沉淀10g。试计算大理石样品中CaCO 3 的质量分数。
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