Thực hiện phản ứng nhiệt nhôm hỗn hợp x gồm Al và sắt Oxit FexOy . Thu được 92,35 gam chất rắn Y . Hoà tan Y trong dd NaOH dư thấy có 8,4 lit khí thoát ra (đktc) và còn lại phần không tan Z . Hoà tan 1/4 lượng chất Z hết 60 gam dd H2SO4 98% (đặc nóng). Giả sử chỉ tạo ra muối sắt III . a) Tính khối lượng Al2O3 trong hỗn hợp Y b) Xác định CTHH của FexOy xem phản ứng xảy ra hoàn toàn

giúp với!!!!!!!!!!!!! Question 1 : “Your face_____dirty, Tom." — "All right I_____it.” A. is/am going to wash B. is/will wash C. has been/am washing D. has been/will wash Question 2 : They_____the results tomorrow morning at nine o'clock. A. announce B. will announce C. will be announcing D. will have announced Question 3 : I suppose when I_____back in two years' time, they_____down all these old buildings. A. come/will pull B. come/will be pulled C. come/will have pulled D. will come/pull Question 4 : Thousands of people_____this exhibition by the end of next month. A. will see B. will be seeing C. will have seen D. see Question 5 : By the time you finish cooking they_____their homework. A. do B. have done C. will do D. will have done Question 6 : Come to see me at 5 this afternoon. I_____home until 4:30. A. don’t arrive B. won’t arrive C. are not arriving D. haven’t arrived Question 7 : No one_____when he_____tomorrow, or whether he will come at all. A. knows/will come B. will know/will come C. knows/is coming D. knows/comes Question 8 : I_____back as soon as I get through with my business. A. will come B. come C. would come D. am coming Question 9 : The police hope they_____the mystery soon. A. will have solved B. will be solving C. will solve D. will have been solving Question 10 : What_____at 10:20 pm tomorrow? A. were you doing B. will you do C. are you doing D. will you be doing Question 11 : You haven’t seen my sister for a long time. us tonight? A. Are you going to visit B. Will you visit C. Are you visiting D. Can you visit Question 12 : At this time next, week they_____in the train on their way to Paris. A. will sit B. will be sitting C. will have sat D. will have been sittingQuestion 13 : By 2025, this area_____turned into an industrial centre. A. will be B. will have been C. will D. has Question 14 : They_____English from nine to ten in this room. Don't let anyone disturb them then. A. will have B. will have had C. will be having D. have Question 15 : The car_____ready for him when he_____tomorrow. A. will be/comes B. was/came C. will have been/comes D. will have been/came Question 16 : I'm going to retire soon. By the first of next July I_____here for 25 years. A. will have been working B. have been working C. had been working D. have worked Question 17 : Don't worry. We_____the report by 11. A. finish B. have finished C. will finish D. will have finished Question 18 : Listen! There's someone at the door. I_____the door for you. A. am going to open B. am opening C. open D. will open Question 19 : “Look at those dark clouds! “Yes, it_____in some minutes.” A. will rain B. is going to rain C. are going to rain D. is raining Question 20 : It’s very hot. the window, please? A. Are you opening B. Are you going to open C. Will you open D. Won’t you open mình còn tần này điểm thoy mong mng giúp

Hình thang MNPQ có MN//PQ,O là giao điểm của hai đường chéo MP và NQ.Chứng minh rằng MP=NQ,OM=ON,OQ=OP

12 12 _ +10- - 15 15

trắc nghiệm, chỉ cần chọn ạ pls chọn đúng có tâm

so sánh lượng co2 sinh ra khi đốt cháy cùng 1 lượng than non(chứa 69,5% khối lượng cacbon) và than đá (chứa 83,2% khối lượng cacbon)lớn hay nhỏ hơn bao nhiêu lần.Trả lời nhanh giúp mình với

a) So sánh 0,(46) và 0,4(64) b) so sánh 1,(454) và 1,4(545)

chứng minh trong 1 tứ giác, mỗi đường chéo nhỏ hơn nửa chu vi của tứ giác

Helpppppp meeeeeeee!!!!!!! Please 😖😖 cần đúng

Viết chương trình nhập vào chuỗi bất kì S sau đó in ra màn hình 2 kết quả: chuỗi con gồm các ký tự trong chuỗi S và tổng các giá trị của các ký tự là số trong chuỗi S Vd: S=’A312BC24DE’ S1:= ABCDE Tong= 3+1+2+2+4=12 giup em với