a/ PTHH : \(2Zn+O_2\rightarrow^{t^0}2ZnO\)

b/ nZnO = 40,8 / 81 \(=\frac{68}{135}\) (mol)

THeo pthh thì nZn = nZnO = 68/135 (mol)

=> mZn = 68/135 x 65 = 32,741 (g)

Ta có số avogadro : 6.10^23

Khi đó số mol nguyên tử S tham gia phản ứng : \(\frac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\)

PTHH : \(S+O_2\rightarrow^{t^o}SO_2\)

0,25 0,25

=> nO2 = 0,25 (mol)

=> VO2 (đktc) = 0,25 x 22,4 = 5,6 (l)

b/ nSO2 = nS = 0,25 (mol)

Khối lượng SO2 thu được là :

\(\frac{64.0,25.95}{100}=15,2\left(g\right)\)

Có nghĩa là cái compa (để vẽ hình) nhé!

I was listening to the radio when the door bell was ringing

=> rang

0 quả táo

hỏi bá đạo zậy

1. The sun (warm) warms the air and (give) gives us light

2. he (meet) will meet / is going to meet the dentis next week.

3. She (come) will come / is going to come here next month

1. I don't have a bookself in my bedroom.

There isn't a bookself in my bedroom.

2. The dog is behind the computer screen.

The computer screen is in front of the dog.

3. I like English best.

My favourite subject is English.

4. There are four people in Phong's family: his parents, his little sister and him.

Phong lives with his family : his parents , his little sister and him.

5. I study at Cau Giay Primary School.

I am a student at Cau Giay Primary School.

6. Lam is not so intelligent as her brother.

Lam brother is more intelligent than her.

7. Ha does not do the homework so carefully as Tam

Tam does the homwork more carefully than Ha.

8. Long does not eat and drink so quickly as Trong.

Trong eats and drinks quicklier than Long.

9. No one in my class is as realiable as Nam

Nam is the most realiable student in my class.

10. Nobody works at home and at school as responsibly as Mr Dragon.

Mr Dragon is the most responsibly works at home and at school.

1. - Yes. I live in an apartment.

=> Do you live in an apartment?

2. - No. There aren't any stores on the street.

=> Are there any stores on the street?

3. - No. My house is old.

=> Is your house new?

4. - Yes. There is a hotel near my house.

=> Is there a hotel near your house?

5. - No. It's very noisy here.

=> Is it quite here?

6. - Yes. The flowers are beautiful.

=> Are the flowers beautiful?

7. - No. She lives in an apartment.

=> Does she live next to your house?

8. - Yes. The lake is behind the house.

=> Is the lake behind the house?

He speaks (speak) English very well, but he (study) is studying Spanish at the moment because he (need) needs to go to South America. Every evening he (write) writes notes about people and places around the world