Giúp e bài này nữa nha Phân tử hợp chất hữu cơ A có hai nguyên tố. Khi đốt cháy hoàn toàn 11,7 g chất A thu được 8,1 g nước. Xác định công thức phân tử của A, biết khối lượng phân tử của A là 78g/mol.

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Question 3: In/ first half/ the match/ our team/ score/ goal. A. In the first half of the match, our team score a goal. B. In the first half of the match, our team scored a goal. C. In the first half on the match, our team scored a goal. D. In the first half on the match, our team score a goal. Question 4: Students/ do/ lot of/ outdoor/ activity. A. Students do a lot of outdoor activities. B. Students does a lot of outdoor activities. C. Students doing a lot of outdoor activities. D. Students did a lot of outdoor activities. Question 5: I/ more/ interested/ go swimming/ my sister. A. I more interested at going swimming than my sister. B. I’m more interested at going swimming than my sister. C. I more interested in going swimming than my sister. D. I’m more interested in going swimming than my sister. Question 6: She/ often/ listen/ music/ read/ book/ free time. A. She often listens to music and reads books in her free time. B. She often listens with music and reads books in her free time. C. She often listens to music and reads book in her free time. D. She often listens to music and reads books at her free time. Question 7: Sunday mornings, Ba/ often/ jogging/ mountains. A. In Sunday mornings, Ba often goes jogging in the mountains. B. On Sunday mornings, Ba goes often jogging in the mountains. C. On Sunday mornings, Ba often goes jogging in the mountains. D. On Sunday mornings, Ba often goes jogging on the mountains. Rearrange the sentences to make meaningful sentences Question 8: racket/ We/ badminton/ need/ play/ to/ a. A. We racket to need a play badminton. B. We racket to play need a badminton. C. We need a racket to play badminton. D. We to need a racket play badminton. Question 9: play/ out/ and/ Go/ with/ friends/ your. A. Go and play out with your friend. B. Go out and play with your friend. C. Go play with out and your friend. D. Go with your friend and play out. Question 10: school/ won/ the/ at/ Who/ marathon? A. Who the marathon won at school? B. Who won at the marathon school? C. Who won at the school marathon? D. Who won the marathon at school?