题目

同学们从山上采集到一种石灰石(主要成分为碳酸钙),他们取80 g该样品进行煅烧实验(所含杂质在煅烧过程中不发生变化),测得反应后固体的质量与反应时间的关系如下表: 反应时间/st0t1t2t3t4t5t6 反应后固体的 质量/g80757066625858 请回答下列问题: (1)当石灰石完全反应后,生成CO2的质量为 __________。 (2)求该石灰石中含CaCO3的质量分数(写出计算过程)。He showed a great talent writing as a child and his special writing style had a great influence later writers.A. with; on B. for; onC. in; with D. in; in