Tính khối lượng của các nguyên tử có trong các hợp chất sau:

a) 4,4g khí cacbonic

b) 12,4g natri Oxit

c) 10,26g nhôm Sunfat

Chắc câu nào làm câu đó nha! ko biết thì cứ để đó vẫn có tick!

1. I wish......................(see) the manager. If only he....................(be) here right now.

2. John wished he.....................(be) an American President, now. He.......................(help) the war victims.

3. If I....................(be) you, I....................(give) her an English dictionary on her birthday.

4. Jeans (make)..................about two hundred years ago, and now they (sell).....................in every corner of the world.

5. If I......................(be) you, I......................study overseas.

6. Minh.....................(always make) so much noise in the class, which annoys everyone.

7. Yesterday, when I..........................(visit) them, they..........................(have) lunch.

8. My brother wish.....................(study) in the United State but if only he.......................(can) speak English well.

9. He..........................(intend) to study aboard since he (be)........................in the secondary school. Thus, he is trying........................(learn) English well.

10.......................you....................(be) in class 9A?-> No, I (be).....................in class 9B.

11......................you.....................(be) free next Sunday morning, Tam? -> No, I and my brother.................(visit) our grandmother.

12. He usually (watch)...............cartoon during his meals when he.....................(be) a little child.

13. Look!....................you.................(know) the girl who (talk)....................to Miss Hoa in the school yard.

14. Charles Dickens.........................(not have) a happy childhood because when he...........................(be) young, his father (throw).......................into prison for (be able).......................to pay their debts.

15. If disasters......................(happen) in an area, people from the other area will offer their help.

Nhờ các bn giúp mìh cái, dười đây có 1 số dơn chất có 2 sau VD: O2, N2, H2, Cl2 vì nó là khí nha các bn.

B1: Hỗn hợp khí A gồm 2lít CH4. 3000ml C2H2 và V lít C2H4. Tỉ khối của A so vs O2(oxi) là 77

a) Tìm V của H2H4

b) Tính thành phần phần trăm về thể tích của các khí có trong hỗn hợp A

B2: Hỗn hợp khí A gồm 0,7 N2(nitơ). 0,5 mol NO2. a mol NO, có tỉ khối so vs ko khí là 1,21

a) Tính a

b) Tính phần trăm số mol của mỗi khí trong hỗn hợp.

B3: Hỗn hợp gồm 12,8g SO2. 7,1 g Cl2(Clo) và a gam H2(Hidro). Tỉ khối của hỗn hợp này so vs H2(Hidro) là 20,1

a) Tìm a

b) Tính phần trăm về khối lượng các khí trong H2(Hidro)

B4: Hỗn hợp khí B gồm 35,5g CO2. 6,4g O2(Oxi) và b gam khí N2(nitơ), có tỉ khối so vs H2(hidro) là 18,53

a) Tìm b

b) Tính phần trăm về khối lượng các khí trong hỗn hợp B

1. "I've always wanted to become a doctor," Helen said -> Helen has always dreamed

2. The nurse said to me, "You should cousult a dermatologist."-> The nurse advised

3. "Don't touch the hot plate," I said to Ann -> I warned

4. The fire chief said, "Everyone must leave the building immediately." -> The chief ordered

5. The man said to the hunters, "Everyone stopped hunting and killing animals." -> The man prevented

6. The instructor said to the students, "You'll have exactly one hour to complete the exam." -> The instructor warned

7. The boy said to the woman, "I've broken the window of your house." -> The boy admitted

8. My parents often said to me, "Good for you! It's good to be independent." -> My parents encouraged

9. Mrs Smith said, "I would like to meet the president." -> Mrs Smith looked forward to

10. He said to the children, "Don't swim in the lake without an adult present." -> He warned

11. "That's great! I'm going to France in August," thought Henry.-> Henry was thinking of

12. Laura said to her roomate, "Remember to set your alarm clock for 6:00 am." -> Laura reminded

13. "Why don't we go to DL this weekend?" said Peter -> Peter suggested

14. Tom said to you, "It's was kind of you to help me. Thank you very much." -> Tom thanked

15. "Let me pay for the meal. I insist," Linda said -> Linda insisted

16. "I hear you won the lottery. Congratulations!" John said to us -> John congratulated

17. Rose said to Gerald, "I'd like you to come to my house on Sunday night to meet my parents." -> Rose invited

18. I said, "I didn't steal the money." -> I denied

19."Is it, or is it not true that you have been misappropriating company funds?" the managing director asked the accountant. -> The managing director wanted

20. "You should have waited for us.", the team leader said to John -> The team leader criticised

21. "I think the whole idea's ridiculous", he said -> He dismissed

22. "Nothing will persuade me to sleep in that haunted house", she said -> She flatly

23. "Shall we go to Paris for the weekend, John?" Mary asked -> Mary suggested

Tính số phân tử số nguyên tử của mỗi nguyên tố có trong các chất sau:

a) 80g Sắt(III) oxit

b) 40g Sắt (III) sunfat

c) 10g canxi cacbonat

Xác định tên và công thức hóa học của các chất sau.

a) 0,75 mol chất x nặng 30g

b) 0,5 mol khí y nặng 14g

c) 2 mol khí z nặng 96g