giải giúp mình bài này với mng mình cần gấp ạ!!!!! Đốt cháy 4,48lit khí metan (đktc) trong bình chứa khí oxi. Sau khi phản ứng kết thúc, dẫn sản phẩm cháy qua bình chứa dung dịch nước vôi trong dư, thu được a gam một kết tủa. Xác định a và tính thể tích khí oxi đã sử dụng (đktc). Cho C=12, O=16, Ca= 40.

Làm hộ mình câu 2 ý b và câu 3 nha

1. Where did you get these old dresses?” - “We _________ them in the old trunk.” A. were found B. finding C. found D. have been found 2. “Are we about to have dinner?” – “Yes, it _________in the dining room.” A. is serving B. serves C. is being served D. served 3. Modern zoos are very different from zoos which _________ fifty years ago A. were built B. were building C. to be built D. building 4. The government should create more job opportunities for women in rural areas. A. Women in rural areas should create more jobs for the govenrment. B. More job opportunities should be created for the government by the women in rural areas. C. More job opportunities should be created for women in rural areas by the government. D. Rural areas should be created more job opportunities by women in the government. 5. . Beethoven’s Fifth Symphony ……………… next weekend. A. is going to be performed B. has been performed C. will be performing D. will have performed 6. What I told Bill was a secret. He ..............it to you. A. shouldn't have repeated              B. shouldn't repeat (lặp lại) C. shouldn't be repeat                        D. shouldn't have been repeated 7. She is ....... singer I've ever met. A. worse                    B. bad                                    C. the worst              D. badly 8. Mary is ....... responsible as Peter. A. more                     B. the most                           C. much                     D. as 9. It is ....... in the city than it is in the country. A. noisily                  B. more noisier                    C. noisier                  D. noisy 10. She sings ........... among the singers I have known. A. the most beautiful          B. the more beautiful C. the most beautifully       D. the more beautifully

Tìm số nguyên x, biết: a) 6.(x+1)<0 b) (2-x).5<0 c) (x+1).(x+5)<0

Giảu giúp mình nha ai giải nhanh nhất mình sẽ chọn người đó là câu trả lời nhanh nhất và đúng nhất nhg phải đúng nha

Giúp tôi giải với Rewrite the following sentences : 1. He asked me a lot of questions. I couldn’t answer most of them. ⇨ He ………………………………………………………………….. 2. Nobody has ever treated me with such kindness. ⇨ I ………………………………………………………………………….. 3. She often get up early in the morning. ⇨ She is used …………………………………………………………….. 4. Because of the invention of the computers , people no longer spend much time in calculating . ⇨ Because …………………………………………………………………. 5. If I had not seen it with my own eyes, I wouldn't have believed in it. ⇨Had I ……………………………………………………………………

Làm hộ mình câu 2 ý B và câu 3 nha

bài văn chứng minh tiếng việt là thứ ngôn ngữ đáng yêu nhất

Bài 2: Tính tổng các số nguyên thỏa mãn: a) -4 < x < 6 b) -8 < x < 9 c) /x/ < 45

Một hình tròn có diện tích 28,26 cm ² .Hỏi hình tròn đó có chu vi bằng bao nhiêu cm?