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#Songminhnguyệt

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\(n_{Cu}=\frac{32}{64}=0,5mol\)

Phương trình hoá học:

\(Cu+2H_2SO_4đ,n\rightarrow CuSO_4+SO_2\uparrow+2H_2O\)

Theo PTTH: \(n_{SO_2}=n_{Cu}=0,5mol\)

\(\rightarrow V_{SO_2}\left(đktc\right)=0,5.22,4=11,2l\)

\(BaO+H_2O\rightarrow Ba\left(OH\right)_2\)

\(n_{BaO}=\frac{1,53}{137+16}=0,01mol\)

\(C\%_{Ba\left(OH\right)_2}=\frac{0,01.\left(137+16.2+2\right).100}{1,53+4,5}=28,36\%\)

tôi,bạn

Hello là xin chào nha

Hok tốt

1. Minh used to………………….his homework late in the evening.

A. does B. do C. doing D. did

2. If people…………………the rules, there are no more accidents.

A. follow B. take care of C. obey D. remember

3. You should………………right and left when you go across the roads.

A. see B. look C. be D. take

4. Hurry up or we can’t……………….the last bus home.

A. keep B. follow C. go D. catch

5. Lan used to go to school……………

A. with bicycle B. by foot C. in car D. by bus

6. Public………………in my town is good and cheap.

A. transport B. tour C. journey D. travel

7. ………………is not very far from here to the city centre.

A. That B. This C. It D. There

8. When there is a traffic jam, it…………………me a very long time to go home.

A. costs B. takes C. lasts D. spends

9. Mai’s dad usually drives her to school…………….her school is very far from her house.

A. but B. though C. because D. or

10. Yesterday Hoa and Lan………………….round West Lake. It took them an hour.

A. cycle B. cycles C. cycling D. cycled

bạn Bùi ngọc Hân sai ở câu 8 nhé

Theo định luật bảo toàn khối lượng:

\(m_A=mo_2=m_{CO_2}+M_{H_2O}\)

Hay: \(m_A+3,2=8,8+1,8\)

\(\Rightarrow m_A=8,8+1,8-3,2\)

\(\Rightarrow m_A=7,4g\)

Vậy \(m=7,4g\)

1. Rick doesn't come with us

2. Sarah doesn't eat the soup.

3. The kids don't make a mess.

4. I am sure you don't get ill.

5. She doesn't feed the cat.

6. She doesn't cook the dinner.

7. I don't ride the bike.

k cho mik nha

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ok anh

ok kb rồi