Hoà tan hết `12,72` gam hỗn hợp `X` gồm `Mg, Fe, FeCO_3` trong dung dịch chứa `1,74` mol `NaHSO_4` và `0,36` mol `HNO_3` thu được dung dịch `Z` ( chỉ chứa muối trung hoà) và `10,335` gam hỗn hợp khí `Y `gồm `CO_2, N_2, NO, H_2` ( trong `Y` có `0,0525` mol `H_2` và tỉ lệ mol `NO : N_2 = 2 : 1` ). Cho `Z` phản ứng hoàn toàn với dung dịch `NaOH`, lọc lấy kết tủa đem nung trong không khí đến khối lượng không đổi, thu được `13,2` gam chất rắn. Biết các phản ứng xảy ra hoàn toàn. Phần trăm khối lượng `Mg` trong `X` gần nhất với giá trị nào sau đây ? `A. 20%` `B. 5%` `C. 9%` `D. 17%` --- mk cảm ơn---

Những phần khoanh vào là câu trả lời cô mình đã chữa hết rồi, các bạn chỉ cần giải thích cho mình vì sao lại chọn đáp án đó thôi. Nhớ là k cần làm đâu nhé, chỉ cần giải thích. Mình cảm ơn

cho a,b,c>0 a.b.c=1 Tìm MAX M=1/(ab+a+2)+1/(bc+b+2)+1/(ca+c+2)

Vẽ tà tữa đê NL: Tự nhiên thèm... Đẹp vào ó xấu là tuii bc ó

VII. Rewrite the following sentences, beginning with the word(s) given 1. "Why don’t we try another method to see the difference?" he said → He proposed 2. She left quietly so that she didn’t disturb her child. → So as 3. This is his first visit to England. → He has 4. We seem to travel less when we become old. → The 5. Jack was careless. He drove beyond the speed limit. → It was 6. The way people work has changed significantly. → There 7. They say that this orchestra is the best in the world. → This orchestra 8. She felt very jealous but she tried to hide her feelings. → Despite 9. Isn’t there a better hotel you could find? → Is this 10. I’m sorry now that I didn’t tell you the truth. → Now I regret

V. Rewrite the following sentences, using the word in bracket 1. We packed our suitcases and then left for the airport. (soon) 2. I don’t mind where we go for our summer holidays. (matter) 3. Could you speak English when you were younger? (able) 4. There will be no more oil available in this area in 2030. (run) 5. "Did you eat the chocolates?" Maria said to Peter. (asked) 6. Bob hadn’t seen his uncle for several years. (gone) 7. We went for a walk although it was raining yesterday. (spite) 8. It’s ages since my sister and I had an argument. (out) 9. I was really bored by the film last night. (found) 10. I can’t wait to see the sights in London. (forward)

III. Correct a mistake 1. We are going to visit our grandparents when we will finish our final exams. 2. Medical students have to study all the theory and practice of medicine. 3. Many animals are totally colorblind, and the condition is rare in humans. 4. Fastly as she drove, she could not catch up with the rest of the team. 5. It is thought that planting more trees are a good way to protect our planet. 6. The man with black short hair over there is one of my father’s friends. 7. Stop accusing me! Why not put you in my position? 8. You mustn’t hurry as we still have enough time to get to the airport. 9. Penguins can slide on their stomachs, pushing itself with their flippers. 10. We were exciting when the match between Vietnam and Thailand began

Vẽ đậu mầm cute nà ;-; NL: Nhớ cute nha! Tự nhiên thấy vuii

Ai giúp em câu này với ạ, chua quá

mn ơi giúp em với! Nhanh nhanh với ạ