Đốt cháy hoàn toàn 7,4 gam hợp chất hữu cơ X thu được 6,72 lít CO2 (đktc) và 5,4 gam H2O. Khi hóa hơi 1,85 gam X, thu được thể tích bằng với thể tích của 0,7 gam N2 cùng nhiệt độ, áp suất.

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Ex3. hãy chuyển các câu sau sang phủ định và nghi vấn 1. They went to Nha Trang last month. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 2. He played table tennis with his father. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 3. Lan saw you in the park last week. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 4. We were in the countryside last summer. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 5. Mrs. Robinson bought a poster. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 6. Liz enjoyed her vacation in Da Lat last year. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 7. Her aunt gave her a new skirt. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 8. He was in our class two hours ago. ------------------------------------------------------------------------------------ 9. They watched a good footballmatch on TV last night. ………………………………………….……………. ……………………..…………………………………? 10. Peter sent that letter to Marry yesterday morning. …………………………………………..……………. ………………………….……………………………? 11. Jane’s mother bought a new car last month. ……………………………………….………………. ………………………..………………………………? 12. We visited Halong Bay three years ago. …………………………………………………………. ………………………..……………………………? 13. They left for Hai Phong in 1999. ………………………………………………..………. ………………………….……………………………? 14. They built a new school in my village ten month ago. …………………………………………….…………. …………………….…………………………………? 15. I borrowed a lot of book in the library last weekend. ………………………………………………………. ………………………………………………………?