题目

有一种可溶性氯化物、溴化物、碘化物的混合物，对其进行如下测定：①称取试样5.00 g，溶于水后加入足量AgNO3溶液，使卤离子完全沉淀为卤化银，质量为3.57 g。将该卤化银加热并通入氯气使AgBr、AgI完全转化为AgCl后，其质量变为2.87 g。②称取试样15.00 g，溶于水后加入氯化亚钯（PdCl2）处理后，其中只有碘化物转化为PdI2沉淀，该沉淀的质量为2.16 g。请完成下列问题：（1）步骤①称取的试样中，所有卤原子的物质的量之和是_____________mol，该基础训练篇（25）On keeping a Diary in English Keeping a diary in English is one of the 1.___________ (effect) ways to improve our English writing ability. 2._____________ (compare) with other forms of writing, it is shorter and takes 3.____________ time. It can help us to develop the habit of thinking in English. 4.____________ we persist in this practice, gradually we’ll learn how to express ourselves in English. In keeping a diary in English, we certainly run up against many 5.__________. In the first place, 6.____________ often happens that we have trouble finding appropriate words and phrases to give expression to our mind. Secondly, there are many idiomatic ways of saying things in Chinese. And it is extremely hard for us to put them into English properly. As far as I _7. ______________ (concern), my  8._____________(suggest) is that we should always have a notebook and a Chinese-English dictionary within easy reach. Whenever something beats us, we can first put it down in our notebook and then consult our dictionary. We can also turn to our English teacher for help, if necessary. In short, I believe that it is 9._____ ______ great use to keep a diary in English for 10.___ ________ development of our writing skills.