49 Thành phần của 1 phân tử có thể biểu diễn theo : - Phần trăm khối lượng của các nguyên tố trong phân tử. - Phần trăm số nguyên tử của các nguyên tố. a) Tính thành phần phần trăm khối lượng của oxi trong hợp chất CO, và từ đó suy ra thành phần phần trăm khối lượng của cacbon trong hợp chất đó. b) Tính thành phần phần trăm số nguyên tử trong hợp chất CO2. Các bạn giúp mình phần b với 🥺

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IX. Complete the second sentence so that it has a similar meaning to the first. 1. There did not use to be many cars on the road before. Now there are………………………………………………………………………………… 2. My brother was a professor at Ha Noi University some years ago, but now he has a job as an enginneer at a big company. My brother used……………………………………………………………………………… 3. Linh walked to school some years ago but now she cycles there. Linh used…………………………………………………………………………………….. 4. My father swam in the pool near his house when he was a boy. My father used……………………………………………………………………………… 5. There are many green trees in front of my house but now it is a big car park. There used…………………………………………………………………………………… 6. I usually stayed up late to watch football matches last year, but now I don’t. I used………………………………………………………………………………………… 7. Linda doesn’t live with her parent any more. Linda………………………………………………………………………………………… 8. My hair is now much longer than that in the past. In the past my hair…………………………………………………………………………… 9. He is not a poor man any more, but he becomes a rich businessman. He used………………………………………………………………………………………. 10. Did you often go to the beach when you lived in Nha Trang? Did you use…………………………………………………………………………………..? 11. Mr and Mrs Smith are flying to Ha Noi now. TRAVELLING 12. Van had a motorbike once, but he doesn’t have any more. USED 13. My father usually goes to work by car. DRIVES 14. This part of the city didn’t have traffic jams very often. USE 15. I used to walk to school when I was young. FOOT