Cho CuCl2 vào dung dịch 20 g NaOH tạo ra Cu(OH)2 và NaCl. Tìm khối lượng chất tham gia và sản phẩm

2 câu trả lời

Đáp án:

 `↓`

Giải thích các bước giải:

 $CuCl_{2}$ + `2NaOH` `→` $Cu(OH)_{2}$ + `2NaCl` 

- $n_{NaOH}$ `=` $\frac{m}{M}$ `=` $\frac{20}{40}$ `=` `0,5` `(mol)`

- Chất tham gia : $CuCl_{2}$ 

- Chất sản phẩm : $Cu(OH)_{2}$, `NaCl`

- Theo pt : $n_{CuCl2}$ `=` $\frac{1}{2}$ `×` `0,5` `=` `0,25` `(mol)`

`⇒` $m_{CuCl2}$ `=` `0,25` `×`  `135` `=` `33,75` `(g)`

- Theo pt : $n_{Cu(OH)2}$ `=` $\frac{1}{2}$ `×` `0,5` `=` `0,25` `(mol)`

`⇒` $m_{Cu(OH)2}$ `=` `0,25` `×` `98` `=` `24,5` `(g)`

- Theo pt : $n_{NaCl}$ `=` $n_{NaOH}$ `=` `0,5` `(mol)`

`⇒` $m_{NaCl}$ `=` `0,5` `×` `58,5` `=` `29,25` `(g)`

$n_{NaOH}=\dfrac{20}{40}=0,5(mol)\\ CuCl_2+2NaOH\to Cu(OH)_2+2NaCl\\ n_{CuCl_2}=n_{Cu(OH)_2}=\dfrac{1}{2}.n_{NaOH}=0,25(mol)\\ n_{NaCl}=n_{NaOH}=0,5(mol)\\ m_{CuCl_2}=0,25.135=33,75(g)\\ m_{NaCl}=0,5.58,5=29,25(g)\\ m_{Cu(OH)_2}=0,25.98=24,5(g)\\$

Câu hỏi trong lớp Xem thêm

Question 1: Did you see that _______ about wildlife in Africa on television last week? A. documentary B. history C. slapstick D. soap opera Question 2: All three TV channels provide extensive _______ of sporting events. A. broadcast B. coverage C. network D. vision Question 3: We hope to bring you further news of this in our next _______ at midnight. A. bulletin B. article C. episode D. piece Question 4: We covered a wide _______ of topics in the interview. A. collection B. extend C. number D. range Question 5: VTV Channel 3 tries to _______ for all tastes. A. regard B. furnish C. cater D. suit Question 6: We are interrupting this program for a news _______. A. alarm B. flash C. alert D. signal Question 7: I must remember to _______ my TV license next week. A. renew B. regain C. replace D. retain Question 8: The _______ comedy in the silent films was especially funny. A. clownish B. mocking C. witty D. slapstick Question 9: The program was so successful that a _______ series is being made. A. after-effect B. backup C. follow-up D. by-product Question 10: There are several TV _______ in Vietnam, and all of them allow advertising. A. channels B. canals C. broadcasts D. screens Question 11: Violent programs on TV may have a bad _______ on children. A. control B. influence C. power D. pressure Question 12: There is a fault at our television station. Please do not _______ your set. A. adjust B. change C. repair D. switch Question 13: The laughter on many comedies on TV isn’t real laughter, it’s _______ laughter. A. bottled B. canned C. corked D. wrapped Question 14: There are many _______ on television where a team of people have to answer questions. A. inquiries B. puzzles C. quizzes D. riddles Question 15: The poor reception on your TV is probably due to outside _______. A. interference B. interception C. interruption D. intervention

4 lượt xem
1 đáp án
8 giờ trước