Tìm kiếm
Huyền Trang
3 tuần trước

cho 10.96gam hỗn hợp 2 muối NaHCO3 và Na2CO3 tác dụng vs dung dịch Clo hiđric dư sau PƯ thu đc 2,688l khí CO2(đktc).Tính thành phần% khối lượng của mỗi chất trong hỗn hợp

Xem đáp án
8 lượt xem

1 câu trả lời

hoangminhava
3 tuần trước

Ta có: $m_{hh}=m_{Na_2CO_3}+m_{NaHCO_3}=10,96(g)$

$\Rightarrow 106.n_{Na_2CO_3}+84.n_{NaHCO_3}=10,96(1)$

$PTHH:Na_2CO_3+2HCl\to 2NaCl+H_2O+CO_2\uparrow$

$NaHCO_3+HCl\to NaCl+H_2O+CO_2\uparrow$

Theo PT: $n_{Na_2CO_3}+n_{NaHCO_3}=n_{CO_2}=\dfrac{2,688}{22,4}=0,12(2)$

Từ $(1)(2)\Rightarrow n_{Na_2CO_3}=0,04(mol);n_{NaHCO_3}=0,08(mol)$

$\Rightarrow m_{Na_2CO_3}=0,04.106=4,24(g)$

$\Rightarrow \%m_{Na_2CO_3}=\dfrac{4,24}{10,96}.100\%\approx 38,69\%$

$\Rightarrow \%m_{NaHCO_3}=100-38,69=61,31\%$

Câu hỏi trong lớp Xem thêm

V. Read the text then choose the best options to complete the statements. (1.0pt) Yesterday, on the way home from school, I saw an accident. A boy was run over by a taxi when he was riding his bicycle. The boy's leg was broken and it was bleeding badly. Someone there tried to stop the bleeding. They put pressure on it and held it tight. A man used his mobile phone to call the emergency service. Some minutes later, an ambulance arrived and sent the boy to the hospital. Two policemen came to the scene immediately. Some people told the police that the taxi was driving at a very high speed when the accident happened. Some others began talking about the traffic accidents these days andblamed the increasing number of accidents on the roads for careless driving and drunk drivers. 1. What did the writer see yesterday? A. a fire B. an accident C. a fighting D. a crash 2. The boy was sent to the hospital by. A. a police 3. What partof his body was hurt?- His. B. a car C. an ambulance D. a taxi A. arm B. leg C. head D. shoulder 4. How was the driver driving when the accident happened?- Very.. A. slowly C. carefully B.well D. fast

2
2 lượt xem
2 đáp án
22 giờ trước

Nước ta có bao nhiêu dân tộc?

1
1 lượt xem
2 đáp án
22 giờ trước

Exercise 2: Giovanni lives in Italy and plans to visit England. Make all the changes and additions necessary to produce, from the following eight sets of words and phrases, eight sentences which together make the letter Giovanni wishes to send to the college where he hopes to study English. Dear Mr. Johnson, 1. A friend/mine/recently/return/England/advise me/write/you. 2. I/hope/come/England/next year/spend/some months/Cambridge. 3. Perhaps/recommend/suitable English family/me stay. 4. While/I/there/take/part – time course/improve/my English. 5. Be/part – time course/your college? 6. If/be/I/be/grateful/you send/application form. 7. Please/tell/much/fees/course/be. 8. I/like/know/date/course/begin. Your sincerely Giovanni Bianchi

2
2 lượt xem
1 đáp án
22 giờ trước

Tìm lỗi sai, giải thích và sửa: The exercise corrects by the teacher every day.

3
3 lượt xem
2 đáp án
22 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.

326
326 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.

239
239 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.

237
237 lượt xem
1 đáp án
1 năm trước

icon Hỏi bài tập
Đề thi - đề kiểm tra Xem thêm
Học lý thuyết Hóa Học Lớp 9 vững kiến thức đứng top 1 lớp