Thể tích khí oxi(đktc) điều chế được từ 31,6 gam KMnO4 là?

Làm giúp mình bài này với mọi người

Giúp em nhé mn chỉ khoanh thoi ạ trước 15h30p nhé ạ, yêu mn❤ xong cho em xin link fb ạ🤣😝

1.Độ muối trong biển và đại dương không giống nhau phụ thuộc vào: * lượng mưa trong năm nhiều và độ bốc hơi kém. nguồn cung cấp nước. độ bốc hơi và mật độ sông ngòi đổ nước vào. lượng băng tuyết tan, vị trí của biển thả điểm nè giải thích nhanh gọn lẹ :)) ( 1 lần duy nhất )

giup minh voiiiiiiiiiiiiiiiiiiiiiiiiiii

Viết 6-8 câu chứng minh viên quan phụ mẫu là kẻ lòng lang dạ thú( Sống chết mặc bay) ko chép mạng

she promised to hand in her assingment tommorow tìm lỗi sai

Mark letter A, B, C or D on your answer sheet to indicate the best sentence that can be made from the words given in each of the following questions. 1. Father/ always/ teach/ him/ not/ look down/people/ less. A. Fathers always taught him not to look down those people with less. B. His father always teaches him to look down for those people with less. C. Her father is always teaching him to look down in those people with less. D. His father always taught him not to look down on those people with less. 2. I/ run/ Amir/ today/ supermarket. A. I ran across Amir today at the supermarket. B. I have ran to Amir today before the supermarket. C. I would run together Amir today at the supermarket. D. I ran into Amir today at the supermarket. 3. I/ tired/ Sophie/ show/ engagement ring/ all/ time. A. I so tired of Sophie showing off her engagement ring all the time. B. I’m not tired about Sophie showing her engagement ring all time. C. I’m so tired of Sophie showing off her engagement ring all the time. D. I’m such tired for Sophie to show off her engagement ring all the time. 4. Police/would/not/give/kidnapper’s/demands. A. The police would not give tolhe kidnapper’s demands. B. The police would not give up the kidnapper’s demands. C. The police would not give away the kidnapper’s demands. D. The police would not give in to the kidnapper’s demands. 5. It/ important/ show/ time. A. It’s important to show up on time. B. It’s more important to show off in time. C. It’s the more important to show of in time. D. It’s the most important to show around before time. 6. We/ go/ have/ put/ trip/ Spain/ until/ September. A. We're going to have to put up our trip to Spain until September. B. We go to have to put of out trip to Spain until September. C. We go to have put our trip to Spain until September. D. We're going to have to put off our trip to Spain until September. 7. Hard/ he/ try, satisfied/ he/feel. A. Harder does he try, satisfied does he feel. B. Hard as he tries, the most satisfied does he feel. C. The hardest he tries, the most satisfied he feels. D. The harder he tries, the more satisfied he feels. 8. Course/ action/ efficient/previous. A. These courses of action are more efficient as the previous one. B. This course of action is more efficient than the previous one. C. Those courses of action are the more efficient in the previous day. D. This course of action is most efficient than the previous one. 9. He/ take/ hat/ show/ me/ new haircut. A. He is taking of hat to show me new haircut. B. He took off his hat to show me his new haircut. C. He takes on his hat to show for me his new haircut. D. He has taken out his hat to show me new haircut. 10. First poem/ good/ second. A. First poem is best than the second. B. The first poem is the best for the second. C. First poem is good than second. D. The first poem was better than the second.

Tìm lỗi sai và sửa giúp mình nha

Một lớp học có 40 học sinh, trong đó có 30 học sinh giỏi Toán, 25 học sinh giỏi Tiếng Việt, 2 học sinh không giỏi môn nào. Hỏi có bao nhiêu học sinh giỏi cả Tiếng Việt và Toán?