Đáp án:
Giải thích các bước giải:
`a.`
$2Zn+O_2\xrightarrow{t^o}2ZnO$
`n_{O_2}=\frac{V}{22,4}=\frac{4,48}{22,4}=0,2(mol)`
`n_{Zn}=2n_{O_2}=0,4(mol)`
`x=m_{Zn}=n.M=0,4.65=26(g)`
`b.`
`n_{ZnO}=2n_{O_2}=0,4(mol)`
`y=m_{ZnO}=n.M=0,4.81=32,4(g)`
`#Devil`
$2Zn + O_2 → ^{t^o} 2ZnO$
$n_{Zn} = n_{ZnO} = 2n_{O_2}$
$n_{O_2}$ = $\frac{V_{O_2}}{22,4}=0,2(mol)$
→ $m_{Zn}$ $= 0,4 . 65 = 26 (g)$
→ $m_{ZnO}$ $= 0,4 . 81 = 32,4 (g)$
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Phân tích đa thức sau thành nhân tử: 4x ² - 12x - 7
Hợp chất A tạo bởi nguyên tố Hidro và nhóm nguyên tử (XOy) hóa trị 3.Biết rằng phân tử A nặng bằng phân tử khối của H2SO4.Thành phần phần trăm theo khối lượng oxi trong A là 65,3 phần trăm.Viết tên, kí hiệu của X và công thức hóa học của A.
Làm hộ mik 4 bài này ạ,mik cảm ơn
mik ko biết làm bài này mn giúp mik với
chỉ cần đáp án Task 3. Combine these pairs of sentences using "so……..that" 1. That woman was very tall. She could almost touch the ceiling. ........ 2. This coat is very big. I can't wear it. ........ 3. The coffee was so strong. She couldn't go to sleep. ........ 4. That bag was very heavy. None of us could carry it. ........ 5. The stadium is very large. It can hold 60,000 people. ........ 6. Those lessons are very difficult. He can't understand them. ........ 7. She was very busy. She couldn't do the housework. ........ 8. The climate was very bad. All the plants couldn't grow well. ........ 9. I'm very tired. I couldn't keep my eyes open. ........ 10. That boy is very lazy. He never does his homework. ........ Task 4. Combine these pairs of sentences using "too ....to" 1. The bag was very heavy. She couldn't carry it. ........ 2. He is very old. He can't run. ........ 3. She is very young. She can't go to school. ........ 4. Tom is very short. He can't play volleyball. ........ 5. It's very late. We can't go to the movies. ........ 6. The question was very hard. We couldn't answer it. ........ 7. The TV program is very exciting. The children won't miss it. ........ 8. You're very young. You can't drive that car. ........ 9. She was tired. She didn't go anywhere. ........ 10. These shoes are very small. I can't wear them. ........
Mong mọi người giúp ..giải theo cách tự luận giúp e...e đag cần gấp...em cảm ơn rất nhiều
Ko cần ghi lại đề, ko cần cách giải, công thức chỉ cần đáp án Task 1. Use SO or SUCH, TOO, ENOUGH 1. The sun shone _______ brightly that she had to put on her glasses. 2. There were _________ few students registered that the class was cancelled. 3. We had _________ wonderful memories of that place that we decided to return. 4. It was ________ a nice day that we decided to go to the beach. 5. The book looked ___________ interesting that we decided to read it. 6. Ray called at _________ an early hour that we weren’t wake yet. 7. There were ____________ many people on the bus that we decided to walk. 8. The benefit was _________ great a success that the promoters decided to repeat it. 9. I’ m not rich ___________to help you. 10. This room is ___________ dark for us to study. Task 2. Rewrite the following sentences as directed 1. It was such an expensive house that nobody can buy it. ⇒ The house was so ........ 2. The food was so good that we ate all of it. ⇒ It was ........ 3. The patient was too weak to get up. ⇒ The patient was so ........ 4. This room is too dark for me to study. ⇒ This room is so ........ 5. This room is too small for us to take the meeting ⇒ This room isn’t ........ 6. The test was so difficult that we couldn’t do it. ⇒ The test was not ........ 7. The map is so old that I couldn’t read it. ⇒ The map is too ........ 8. He spoke so fast that we couldn’t hear him well ⇒ He didn’t ........
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