Đốt cháy 1kg than ( cacbon) trong khí oxi. Biết rằng trong than có chứa 5% tạp chất. a. Tính thể tích khí oxi cần thiết để đốt cháy hết 1kg than trên. b. Tính thể tích khí CO 2 sinh ra trong phản ứng.

Các câu hỏi liên quan

Who has written that novel? => Who..................................... His family will see him off at the airport. ( see sb off : tiễn ai ) =>He........................................ We will have to repair our car soon. ( sửa chữa ) =>Our car....................................... Passengers shouldn't throw away their tickets. ( ném đi ) =>Passengers’ tickets............................... A machine could do this work much more easier. => This work............................... They can not hold the meeting in this room. ( hold -> held -> held : tổ chức, nắm giữ ) => The meeting............................. People ought to tell us how much they expected us ( mong đợi ) .=> We.......................... I. Choose the best answer A,B,C or D to complete the sentences. 1. The longest fish …………..by my father last week. A. was catching B caught C was caught D catch 2. This letter …………yesterday morning. A. was delivered B. delivered C is delivered D be delivered 3. David ………….in London in 1995. A is born B. born C. was born D is born 4. When……………………? In 1980. A. is the church built B. was the church built C did the church built D. has the church been built 5. The thief ………………soon. A. will be arrested B is arrested C. will arrested D. arrested 6. The old house on the corner………..down last year. A knocked B. is knocked C. has been knocked D. was knocked 7. No decision …………………recently. A. is made B was made C is being made D. has been made 8. The cat ………….since this morning. A hasn’t been fed B doesn’t fed C isn’t fed D wasn’t fed 9. I don’t believe that this play………….by Shakespear. A is written B was written C has been written D will be written 10. No one knows why the man……………….last night. A has been killed B. is killed C was killed D was being killed 11. The employees …………….to work very hard every day. A force B forced C are force D are forced 12. This swimming pool ……….by thousand of people each week. A use B used C is using D is used 13. The report must………….right now. A be finished B is finished C finished D be finishes 14. Million of books………….out of this bookstore every year. A sell B were sold C have been sold D are sold 15 "Are we about to have dinner?". "Yes, it _____ in the dinning room". A. is serving B. serves C. is being served D. served 16 "Why is Stanley in jail?" "He_____ of robbery". A. has been convicted B. has been convicting C. has convicted D. convicted 17 "Where's the old chicken coop?" "It_____ by a windstorm last year". A. destroy B. is destroyed C. was destroyed D. destroyed 18 "We're still looking for Thomas". "Hasn't he_____ yet?". A. been found B. to find C. found D. being found 19 "Whatever happened t that fortune - teller?" "I don't know. She _____ around her in a long time". A. hasn't seen B. didn't see C. hasn't been seeing D. hasn't been seen 20 "What a beautiful dress you're wearing!" "Thank you. It____ especially for me by a French tailor". A. is made B. has made C. made D. was made 21 "Those eggs of different colors are very artistic". "Yes, they_____ in Russia". A. were painted B. were paint C. were painting D. painted 22. Gold_____ in California in the nineteenth century. A. was discovered B. has been discovered C. was discover D. they discovered 23. All planes_____ before departure. A will checked B will has checked C will be checked D will been checked 24. I wanted_____ by the head of the company, but it was impossible. A to see B to be seen C seeing D being to see