1.Để hòa tan 2,16g oxit của kim loại R vào dung dịch HCl cần 10,005g dung dịch HCl 21,9%.Xác định tên kim loại

2.Cho một lượng nhôm dư vào 300ml dung dịch HCl 2M.

a.Viết PƯ xảy ra

b.Tính thể tích khí hidro thu được ở đktc và khối lượng nhôm tham gia phản ứng.c.Dẫn hết ượng khí hidro ở trên qua ống nghiệm đựng FeO dư đun nóng,thu được 5,6g Fe.Tính hiệu suất phản ứng

Use phrase or clause of purpose to combine each pair of the following sentences(Sử dụng cụm từ hoặc mệnh đề mục đích để kết hợp từng cặp câu sau đây)
1.She went to the bookshop.She wanted to buy a dictionary
2.My brother is learning English.He can get a good job
3.My parents sent me to the U.S.A.They wanted me to study computer there
4.The teacger spoke very slow.He wanted his pupils to understand what he said
5.Miss Hoa locked the door.She didn't want to be disturbed
6.We turned out the lights.We didn't want to waste electricity
7.They tried to do their job well.They wanted the oss to increase their salary
8.I'm learning English.I want to read books in Englishy father drove carefully.He didn't want to case accidents
9.Please close the widows.I don't want anybody to look at my house
10.The notice are written in sereval languages.Every may understand them
11.She needs a job.She wants to support her old parents
12.My sister wore warm clothes.She didn't want to get cold
13.He's studying hard.He wants to keep pace with his classmate
14.These men were talking in whipspers.They didn't want anyone to hear their conversation