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钴(Co)化合物对化学键的研究起着重要的作用。为测定某钴的配位化合物[Co(NH 3 ) x Cl y ]Cl z (相对分子质 量为250.5)的组成,进行如下实验: ①称取样品0.5010g,加入过量的NaOH溶液,煮沸蒸出所有的氨气,测得氨气的体积为224.0mL(已折换 为标准状况下)。 ②另称取该物质样品0.2505g,溶于水,以0.1000mol/L AgNO 3 溶液滴定至恰好反应完全,消耗AgNO 3 溶液20.00mL。相应反应式为:[Co(NH 3 ) x Cl y ]Cl z +zAgNO 3 =[Co(NH 3 ) x Cl y ](NO 3 ) z +zAgCl↓ 通过计算求: (1)该钴化合物的化学式。 (2) [Co(NH 3 ) x Cl y ]Cl z 中Co元素的化合价为__________,Co的配位数为___________。
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