nguyenlinhchi2005

2 năm trước

Giúp em bài hóa này với: Khi cho clo tác dụng với 78 gam benzen (bột sắt làm xúc tác) người ta thu được 78 gam clobenzen. Tìm hiệu suất của phản ứng.

Xem đáp án

20 lượt xem

2 câu trả lời

Quang Cường

2 năm trước

C6H6+ Cl2 (Fe,t*)-> C6H5Cl+ HCl

nC6H5Cl= 78/112,5= 0,693 mol= nC6H6 pu

nC6H6 bđ= 78/78= 1 mol

Vậy H= 0,693.100:1= 69,3%

diemhuongsphh

2 năm trước

Đáp án:

$H\% = 69,33\% $

Giải thích các bước giải:

$\text{PTHH:}$ ${C_6}{H_6} + C{l_2}\xrightarrow{{Fe,{t^o}}}{C_6}{H_5}Cl + HCl$

$\text{Ta có:}\ {n_{{C_6}{H_5}Cl}} = \dfrac{{78}}{{112,5}} \approx 0,6933\ mol$

$\text{Theo PTHH:}\ {n_{{C_6}{H_6}\ pư}} = {n_{{C_6}{H_5}Cl}} \to {m_{{C_6}{H_6}\ pư}} = 54,08\ g$

$\to H\% = \dfrac{{{n_{{C_6}{H_6}pư}}}}{{{n_{{C_6}{H_6}\ bđ}}}}.100\% = \dfrac{{54,08}}{{78}}.100\% = 69,33\% $

Đăng nhập để trả lời

Câu hỏi trong lớp Xem thêm

Read the following passage and mark the letter A, B, C or D to indicate the correct word thatbest fits each of the numbered blanks.Birds are fascinating to many people, and bird watching is a popular hobby. The best time towatch birds is in the early morning, (31)_____birds are usually very active at that time of day. Theobserver must keep still and quiet in order not to (32)_the birds away. If you live in a part ofthe world where migratory birds spend their breeding season, then you will have the (33)_tosee nest-building activity. Over the ages, different species of birds have evolved with different types ofnest-building skills. It makes an interesting study to (34)_the different types of nests built bybirds and to watch them as they build their nests. After the breeding season is over and the babies haveleft the nest, it is time for the birds to head for (35)_____parts of the world to spend the wintermonths. Birds navigate to their winter feeding grounds, using the stars or the sun as their guide. 31. A. so B. because C. though D. but 32. A. upset B. throw C. frighten D. worry 33. A. time B. prospect C. occasion D. opportunity 34. A. look at B. take after C. care for D. see off 35. A. warmer B. cooler C. hotter D. colder

3 lượt xem

1 đáp án

11 giờ trước

1) Nước đá khớp được làm từ gì ? Tại sao nó có thể tạo hơi lạnh được như đá khô ?
2) Vì sao khi mở bình nước ngọt có ga lại có nhiều bọt khí thoát ra ?
3) Tại sao CO2 được dùng để dập tắt các đám cháy ?
~GIÚP MÌNH MẤY CÂU NÀY NHAA
🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

3 lượt xem

2 đáp án

11 giờ trước

Mark the letter A, B, C or D to indicate the word whose underlined part is pronounced differently from that of the rest in each of the following questions. 1. A. chopstick B. champion C. character D. cherry 2. A. supper B. hungry C. punish D. campus 3. A. warned B. reduced C. covered D. moved Mark the letter A, B, C or D to indicate the word that differs from the other three in the positionof primary stress in each of the following questions. 4. A. ancient B. spacecraft C. despite D. even 5. A. generous B. extensive C. resources D. eternal 6. A. regular B. poisonous C. atmosphere D. appliance

3 lượt xem

2 đáp án

11 giờ trước

if you don't wear a helmet , you can't ride your bike => Unless

3 lượt xem

2 đáp án

11 giờ trước

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

378

378 lượt xem

1 đáp án

1 năm trước

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

288

288 lượt xem

1 đáp án

1 năm trước

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

273

273 lượt xem

1 đáp án

1 năm trước

Giúp em bài hóa này với: Khi cho clo tác dụng với 78 gam benzen (bột sắt làm xúc tác) người ta thu được 78 gam clobenzen. Tìm hiệu suất của phản ứng.

2 câu trả lời

if you don't wear a helmet , you can't ride your bike => Unless

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

Đề thi - đề kiểm tra Xem thêm

Chúng tôi

Học tốt

Liên kết

Mạng xã hội

Giúp em bài hóa này với: Khi cho clo tác dụng với 78 gam benzen (bột sắt làm xúc tác) người ta thu được 78 gam clobenzen. Tìm hiệu suất của phản ứng.

2 câu trả lời

if you don't wear a helmet , you can't ride your bike => Unless

Choose the best answer.I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.

Choose the best answer.We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.

Choose the best answer.I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

Đề thi - đề kiểm tra Xem thêm

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.