Hòa tan 12,4 gam hỗn hợp gồm Fe3O4, MgO, ZnO trong V (ml) dung dịch H2SO4 0,2 M vừa đủ thu được dung dịch X. Sau phản ứng hoàn toàn cô cạn dung dịch X thu được 25,2 gam muối khan. a/ Viết PTHH b/ Tính a giúp mình giải bài này với ạ!!! Mình cần gấp, một tiếng nữa mình phải nộp bài rồi ạ!!!

Trên cùng một nửa mặt phẳng bờ chứa tia Ox vẽ hai tia Oy , Oz , Ot sao cho góc yOz và góc yOt là hai góc kề bù. Chứng tỏ Ox là tia phân giác của góc yOt.

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Question 16. Thousands are staving because of the failure of this year’s harvest. A: hungry B: full C: poor D: rich 3 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (17). Do you know about the history of Jeans? Jeans are very popular with (17)________people all over the world. Some people say that jeans are the “uniform” of youth. But they haven’t always been popular. The story of jeans (18)________almost two hundred years ago. People in Genoa, Italy made pants. The cloth made in Genoa was (19)________“jeanos”. The pants were called “jeans”. In 1850, a salesman in California began selling pants made of canvas. His name was Levi Strauss. Because they were so strong, “Levi’s pants” became (20)________with gold miners, farmers and cowboys. Six years later Levis began making his pants with blue cotton cloth called denim. Soon after, factory (21)________in the US and Europe began wearing jeans. A: rich B: poor C: young D: old 4 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (21). Do you know about the history of Jeans? Jeans are very popular with (17)________people all over the world. Some people say that jeans are the “uniform” of youth. But they haven’t always been popular. The story of jeans (18)________almost two hundred years ago. People in Genoa, Italy made pants. The cloth made in Genoa was (19)________“jeanos”. The pants were called “jeans”. In 1850, a salesman in California began selling pants made of canvas. His name was Levi Strauss. Because they were so strong, “Levi’s pants” became (20)________with gold miners, farmers and cowboys. Six years later Levis began making his pants with blue cotton cloth called denim. Soon after, factory (21)________in the US and Europe began wearing jeans. A: drivers B: farmers C: workers D: cowboys 5 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 13. Helen: “What a lovely house you have!” Mary: “__________________” A: Of course not. it’s not costly. B: No problem C: I think so. D: Thank you. Hope you will drop in. 6 Choose the word whose underlined part is pronounced differently from the others. A: visited B: celebrated C: persuaded D: looked 7 Choose the correct sentence (A, B, C or D) made from the suggested words. Question 22. Teacher’s Day/ celebrate/ twentieth/ November. A: Teacher’s Day was celebrated on the twentieth of November. B: Teacher’s Day celebrates on the twentieth of November C: Teacher’s Day is celebrated on the twentieth of November. D: Teacher’s Day celebrated on the twentieth of November 8 Choose the correct sentence (A, B, C or D) that has the same meaning to the given one. Question 24. “Why don’t you use a password to protect your files?”, An said to me. A: An encouraged me to using a password to protect my files. B: An advised me to used a password to protect my files. C: An asked me why I didn’t use a password to protect my files. D: An advised me to use a password to protect your files. 9 Choose the best answer A, B, C or D to complete the sentence. Question 9. What __________________ if you saw a UFO? A: did you do B: will you do C: would you do D: do you do 10 Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) to each of the following questions. Question 15. As a government official, Benjamin Franklin often traveled abroad. A: widely B: secretly C: overseas D: alone

CÂU 4: Tìm số nguyên x, biết: 3.x + I-3 I = 14

Tính tổng đại số S1 = 2 - 4 + 6 - 8 + ... + 1998 - 2000

Gọi C là điểm nằm trên đoạn thẳng AB. ( C ≠ A, C ≠ B). Trên nữa mặt phẳng bờ chứa đường thẳng AB, kẻ các tia Ax, By vuông góc với AB. Trên tia Ax lấy điểm I ≠ A. Đường thẳng vuộng góc với CI tại C cắt By tại K. Đường tròn đương kính CI cắt IK tại P. a) CM: Tứ giá CPKB nội tiếp được trong một đường tròn. b) Tam giác APB vuông tại P. c) Biết các điểm A, I, B cố định . Hãy xác định vị trí của C trên đoạn thẳng AB (C ≠ A, B) sao cho tứ giác ABKI có diện tích lớn nhất?

viết một đoạn văn về những hiểu biết của em về dich covid 19 và cách gia đình em làm để chiến thắng bệnh dịch này

Giải hộ mk câu 3 Mk cần gấp, hứa vote 5 sao

Cho 6,8 g hỗn hợp gồm Mg và Fe tác dụng với dd HCl dư thì thu được 3,36 lít khí (đktc) . Xác định thành phần trăm về khối lượng của mỗi kim loại có trong hỗn hợp và khối lượng muối tạo thành

Dùng 100 tấn quặng Fe2O3 dễ luyện gang (95% sắt). Tính khối lượng gang thu được. Cho biết hàm lượng Fe2O3 trong quặng là 80%. Hiệu suất quá trình phản ứng là 93%. Giup mink cau 3voi ^^