Trộn 1/3 lít dd HCl (dd A) với 2/3 lít dung dịch HCl (dd B) được 1 lít dd C. Cho 1/10 dd C tác dụng với dung dịch AgNO3 dư thu được 8,61 gam kết tủa trắng. Tính nồng độ mol của dd A và dd B. Biết nồng độ dd A gấp 4 lần dd B.

pt quy về pt bậc nhất: x-3/4+2x-1/3=2-x/6 1/2.(x+1)+1/4.(x+3)=3-(1/3)(x+2) 3x-2/3-(2)=4x+1/4 x+4/5-x+4=x/3-x-2/2 4-5x/6=2.(-x+1)/2 -(x-3)/2-2=5.(x+2)/4 2.(2x+1)/5-6+x/3=5-4x/15 7-3x/2-5+x/5=1 x-1/2+3.(x-1)/8=11-5x/3 3+5x/5-3=9x-3/4

có hai phương pháp điều chế HCl Phương pháp 1 :cho muối clorua tác dụng với h2so4 đc rồi hòa khí hcl vào nc phương pháp 2 tổng hợp H2 và Cl2 Nêu nguyên tắc kĩ thuật để 2 phương pháp đạt hiệu suất cao nhất và giải thích ? (phần giải thích ghi kĩ giùm em . Cảm ơn <3 )

giúp mk câu 1 và 2 phần tự luận vs các bạn

giải pt a)(3x-2)(x+6)(x²+5)=0 b) (2x+5)²=(3x-1)² c) 4x²(x-1)-x+1=0 d) 9(2x+1)=4(x-5)² e) x^3-4x²-12x+27=0 f) x^3+3x²-6x-8=0

, tinh thần chống Pháp của nhân dân Nam Kì được thể hiện như thế nào

Choose the best answer 1. Are you_____________with the result? A. satisfy B. satisfied C. satisfying D. be satisfying 2. My brother sings_____________than me. A. better B. weller C. gooder D. well 3. The results of the work are____________. We are very sad. A. disappointed B. satisfying C. disappointing D. satisfied 4. This is a____________film and it makes me cry a lot. A. funny B. moving C. comedy D. excited 5. ____________he has a lot of money, he is very mean. A. Because B. Although C. Despite D. Because of 6. She is young but she performs____________. A. excellent B. excel C. excellently D. excellence 7. This is a(n)______________on real life during wars in Vietnam in 1945. A. horror film B. sci-fi C. comedy D. documentary 8. He___________the Oscar Prize as the best actor last year. A. won B. acted C. performed D. directed 9. He is lazy.____________, he is always lucky in examinations. A. Therefore B. But C. However D. So 10. I decided to quit this job_____________the low salary. A. because of B. despite C. because D. although 11. " Thanks for a lovely dress!" - “_____________” A. You're welcome B. Yes, I do C. No, thanks D. I don't know 12. They are very interested_____________going to the zoo. A. to B. in C. at D. for 13. There aren’t ____________ means of transports in the countryside’s life. A. many B. much C. a few D. a little 14. You look ____________ in that dress. A. love B. lovely C. loving D. lovelily 15. _________________, the nicest apartment is also the cheapest. A. Luckily B. Unluckily C. Lucky D. Unlucky 16. An watches TV every evening. ________________. A. I do, neither. B. So I watch. C. I like so. D. So do I. 17. ______________ is the film? – Two and a half hours. A. How far B. What time C. When D. How long 18. Tim spends a long time ______________ video games. A. play B. playing C. to play D. plays 19. Why are you late? – Because I _______________ the bus. A. missed B. mixed C. caught D. lost 20.. _______________ he had enough money, he refused to buy a new car. A. In spite B. In spite of C. Despite D. Although 21. _______________, he walked to the station. A. Despite being tired B. Although to be tired C. In spite being tired D. Despite tired 22. She left him _______________ she still loved him. A. even if B. even though C. in spite of D. despite 23. ________________ her lack of hard work, she was promoted. A. Because B. Even though C. In spite of D. Despite of 24. _______________ they are twin brothers, they do not look like. A. Although B. Because of C. Because D. In spite of 25. Julie failed the exam _______________ of working very hard. A. despite B. in spite C. even if D. though 26. She walked home by herself _______________ she knew that it was dangerous. A. if B. though C. because D. which 27. ______ they are brothers, they do not look like. A. Although B. Even C. Despite D. In spite of 28. She left him ______ she still loved him. A. in spite B. even though C. in spite of D. despite 29. He refused to give up work, _________ he’s won a million pounds. A. despite B. however C. even though D. as though PHONETICS 1 A. head B. break C. bread D.heavy 2 A.said B. wait C.mail D. sail 3 A. start B. lake C.station D. came 4 A. ancient B. radio C. nature D. village 5 A. indicate B. mistake C. take D. says 6 A. lazy B. date C. hate D. car 7 A. said B. wait C. train D. paid 8 A. safety B. waste C. taste D. chat 9 A. security B. belt C. let D. center 10 A. head B. seat C. heavy D. weather II.Choose the best answers 1. …………………..does it take to go from Ha Noi to Ho Chi Minh City by plane? A. How far B. How much C. How long D. How many 2. There……………a bus station in the city center, but it has been move to the suburds. A. used to be B. used to have C. use to have D. were 3. I………………..marbles when I was young but now I don’t. A. play B. used to play C. have played D. didn’t use to play 4. We should…………….the street at the zebra crossing. A. walk B. walk on C. walk through D. walk cross 5. Drivers have to……………….their seatbelt whenever they drive. A. put B. tie C. fasten D. put on 6. We should wait for the traffic lights……….before you cross the street. A. turn green B. to turn green C. turn yellow D. to turn yellow 7. All of us have to obey…………strickly. A. traffic rules B. traffic C. traffic jam D. regular 8. Cyclists and motorists have to wear…….when they ride a motorbike. A. hard hat B. cap C. mask D. helmet 9. He forgot to give a…….before he turned left and got a ticket. A. signal B. sign C. light D. hand 10. ………is it from your house to your school? A. How often B. How long C. How far D. now / mother / I/ my / cycle / used / there / to / take / to / me/ school / but. ………………………………………………………………

: Cho 72,6 gam hỗn hợp ba muối CaCO3, Na2CO3 và K2CO3 tác dụng hết với dung dịch HCl, có 13,44 lít khí CO2 thoát ra ở đktc. Khối lượng hỗn hợp muối clorua thu được bằng bao nhiêu?

giai phuong trinh: x^4+2x^3-11x^2-12x+36=0

hoa tan hoan toan 8,5 g hon hop X gom hai kim loai kiem lien tiep A ,B vao nuoc thu duoc 200 ml dd Y va 3,36 lit khi .De trung hoa 100 ml dd Y can dung V lit dd z ( HCL2M,H2SO4 1M ) . Tim 2 kim loai A,B va gia tri cua V ?