Một hỗn hợp X gồm SO2 và O2 theo tỉ lệ mol 2:3 chiếm thể tích là 11,2 lít ở đktc a) Tính % thể tích SO2 và O2 trong hỗn hợp X. b) Đốt hỗn hợp này ở nhiệt độ cao có chất xúc tác thích hợp, sản phẩm tạo thành là SO3, biết có 20% lượng khí SO2 tham gia phản ứng. Xác định tỉ khối của hỗn hợp khí sau phản ứng so với He (giả thiết ở nhiệt độ này, SO3 ở thể hơi)

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Test 2 I. Rewrite these sentences 1. This is the best essay I have ever written. I................................................................................................................... 2. It took us 3 hours to open the door. We ................................................................................ 3. I haven’t been to the dentist’s for two years. It’s …………………………............................... 4. I've never heard a more amusing story than this one. This is ......................................................................... 5. I have never seen a more beautiful house than this. -This.................................................................................. 6. I haven’t seen my old school friend for 2 years. - The last ............................................................... 7. We started living here fifteen years ago.  We have ........................................................ 8. He has never played a computer game before.  This is ................................................................. 9) The last time it rained here was a fortnight ago. It ................................................................................ 10. I’ve been working for this company for ten years. I started ....................................................................... II. Give correct form of verbs 1. why are you under the table? You (look) for something? 2. . The radio (play) since 7 a.m 3/ "Where is Jane?" "Down stairs sir" ."She (greet) the guests." 4/ It is 2 years since I ( last give) presents on Christmasday. 5/ "You (know) the man for many years?" 6/ He (work) hard all the week, but today he (have) a good time. 7. We don’t enjoy (use) as cheap labour. 8. It is difficult to get used to (eat) with chopsticks 9. She gets used to (take) to the zoo on weekends. 10. It’s ages since I last (have) Chinese food.