为测定石灰石中碳酸钙的纯度,取一定量的样品与足量的稀盐酸在烧杯中反应(杂质不反应也不溶于水),有关数据如表. 请计算: (1)反应生成CO2的质量为 (2)该石灰石样品中碳酸钙的质量分数.(写出计算过程 答案:(1)3.3g (2)75%(过程省略)6、 Yuan
Longping’s hard work,China now
produces enough rice to feed her people every year.
A.Because of B.Because C.With the help of
D.Up to