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nguyenthihuyena4k66
2 năm trước
Trong phản ứng khi cho 2,32 gam một oxit sắt tác dụng hết với dung dịch HCl người ta thu được 0,72 gam H2O sinh ra. a, Viết phương trình phản ứng xảy ra? b, Tính khối lượng tổng muối sắt thu được sau phản ứng? c, Xác định công thức phân tử của oxit sắt trên?
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EX 1: 1. They have been living in Madrid ________ 1972. 2. He has been in prison ________ four years. 3. He has known about the fact ________ a long time. 4. Conditions have changed a lot ________ we were children. 5. Our teacher has been very ill ________ the last month. 6. I haven't eaten anything ________ twenty-four hours. 7. In fact he is always very rude. We have been waiting for him ________ half an hour. 8. I haven't seen him for three years. It is because I haven't been there ________ I left school. 9. I have been trying to mend this old fashioned car ________ hours. 10. One of my friends has been teaching in Tokyo ________ three years. I haven't met him since last year. 11. I haven't enjoyed myself ________ two weeks since I heard that my final exam grades were low. 12. I know that you have never seen a lion ________ you were born. Then now I say that we can go to the zoo and see one. 13. The police have been looking for him for two weeks ________ he escaped from the prison. 14. He hasn't spoken to me even a word ________ the last meeting. 15. I haven't phoned him ________ a week. 16. He has been the principal of our high school ________ 1988. 17. Dean has been learning Japanese ________ two years.

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