a) Đặt \(n_{KMnO_4\left(phan.huy\right)}=x\left(mol\right)\)

\(PTHH:2KMnO_4-t^o->K_2MnO_4+MnO_2+O_2\)

                     \(x\)        \(-->\)   \(\frac{x}{2}\)  \(->\frac{x}{2}->\frac{x}{2}\)           (mol)                

Có : \(m_{CR\left(giảm\right)}=m_{Oxi}\)

=> \(\frac{x}{2}\cdot32=400-376\Rightarrow x=1,5\left(mol\right)\)

=> \(m_{KMnO_4\left(phan.huy\right)}=1,5\cdot158=237\left(g\right)\)

b) \(n_{O_2}=\frac{x}{2}=0,75\left(mol\right)\)

=> \(V_{O2}=0,75\cdot22,4=16,8\left(l\right)\)

c) \(m_{KMnO_4\left(spu\right)}=400-237=163\left(g\right)\)

Theo pthh : 

\(n_{K_2MnO_4}=\frac{x}{2}=0,75\left(mol\right)\Rightarrow m_{K_2MnO_4}=147,75\left(g\right)\)

\(n_{MnO_2}=\frac{x}{2}=0,75\left(mol\right)\Rightarrow m_{MnO_2}=65,25\left(g\right)\)

=> \(\hept{\begin{cases}\%m_{KMnO_4}=\frac{163}{376}\cdot100\%=43,35\%\\\%m_{K_2MnO_4}=\frac{147,75}{376}\cdot100\%=39,3\%\\\%m_{MnO_2}=\frac{65,25}{376}\cdot100\%=17,35\%\end{cases}}\)

~Thanks!!!~

1, What is the name of your school ?
=> The name of my school is + tên trường.
2 , Where is the school ?
=> My school is in + tên xã + village, tên huyện + district, tên tỉnh + province.
3, How many students does the school have ? 
=> The school has/ There are + số lượng + students.
4 , What do students do at school ? 
=> Students/ They + study at school.
5, What is interesting / fun about your school ? 
=> My school is interesting/ fun about + điều ấy.
6 , Câu này kO rõ! What is your school day ? 
=> My school day are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.
7, What do you do in the morning ?
=> I play game with my friend.
8 , What do you wear ?
=> I wear uniform at school
9 , What subiject do you ?
=> I + môn b thik
10 , What activities do you do?
=> I play ...

Mik ko bik ghi có đúng ko, nhìu khi đầu nghĩ z mà lại ghi khác vs lại có nhìu cái mik ghi nhanh quá nên sai, mong b với mn bỏ qua nhé

*HỌC TỐT*

I/ dùng từ gợi ý viết lại thành câu sao cho nghĩa ko đổi

1 we started living here in 1995

we have lived here since 1995

2 it's unneccessary for us to drive so fast

we don''t have to drive so fast

3 Trung is the most intelligent student in my class

No one in my class is more intelligent than Trung

4 The coffee was too weak to keep us awake

The coffee wasn't enough strong to to keep us awake

5 Huong last wrote to her parents two months ago.

Huong hasn't written to her parent for two months

1. Mô tả sự hình thành quan hệ sản xuất tư bản chủ nghĩa qua 2 giai cấp : 
- Giai cấp tư sản : Các chủ xưởng, chủ đồn điền và những thương nhân giàu có 
- Giai cấp vô sản : Người làm thuê 
Giai cấp tư sản dùng đủ mọi hình thức để bóc lột đến kiệt quệ sức lao động của giai cấp vô sản
~~~> Quan hệ sản xuất tư bản chủ nghĩa được hình thành

- Giai cấp tư sản : Quý tộc, thương nhân giàu có nhờ cướp của và tài nguyên các nước thuộc địa. Họ mở rộng sản xuất, lập đồn điền. Bóc lột những người làm thuê.

- Giai cấp vô sản : Nông nô bị tước đoạt ruộng đất nên phải làm thuê cho tư sản và bị tư sản bóc lột.

* Quan hệ sản xuất tư bản chủ nghĩa hình thành.

Nhớ tick cho mk nha !

Mô tả sự hình thành quan hệ sản xuất tư bản chủ nghĩa qua 2 giai cấp :
- giai cấp tư sản : Các chủ xưởng, chủ đồn điền và những thương nhân giàu có
- giai cấp vô sản : Người làm thuê
Giai cấp tư sản dùng đủ mọi hình thức để bóc lột đến kiệt quệ sức lao động của giai cấp vô sản
~~~> Quan hệ sản xuất tư bản chủ nghĩa được hình thành

1 ( lucky) UNLUCKILY I forgot my book at home

2. He learns how to repair (house) HOUSEHOLD appliances

3. American students take part in different ( act) ACTIVITIES at recess

4. He is a ( home) HOMELESS child

5. John is the (happy) HAPPIEST person that we known

6. Nam doesn't read as ( quick) QUICKLY as her sister

7. Birthday is one of the family ( celebrate) CELEBRATIONS

8. It was a ( beauty) BEAUTIFUL song and she rang very (beauty) BEAUTIFULLY

9. Nam is the (good ) BEST student in his class

10. You don't need do this exercise it is ( important ) UNIMPORTANT

11. His sudden ( die) DEATH must be ashock to you

12. He is bored because of the ( understand) MISUNDERSTANDING between him and his friends

13. An orphan is a ( parent) UNPARENTED child

14. The play is ( bore) BORING so I'm very ( bore) BORED

15. I hope our ( friend) FRIENDSHIP is forever

16. She looks ( friend) UNFRIENDLY so I'm afraid

17. His ( happy) HAPPINEST also makes me happy

18. He is sad because his exam is ( success) UNSUCCESSFUL

19. I didn't know his ( important) IMPORTANCE

20. I believe you. You are ( truth)TRUTHFUL

21. Steam engine is a important (invent) INVENTION . The ( invent) INVENTOR is Jame Watt

22. My father is a ( science) SCIENTIST

23. He has a lot of ( music) MUSICAL intrusments

24. Today our (live) LIFE becomes more comfortable

25. Be ( care) CAREFUL when you open the door

26. I hope we have ( sun) SUNNY weather for our holidays

27. May I introdue my ( young) YOUNGER sister?

28. ( lucky ) LUCKILY we have passed the examination

29. This lilkmaid is the (good) BEST worker on thier farm

30. The museum is the ( far)FURTHER away of the two building

31. We must take ( act) ACTION before things get worse

32. Conan Doyle was famous as the ( creat) CREATOR of the great detective Sherlock Holme

33. New car is more ( economy) ECONOMICAL than the one t had before

34. Working on the car make my hands ( grease ) GREASY

35. The weather in this country is so ( predict) UNPREDICABLE that you never know what to expect.

36.Mai and her brother were sent to ( board) ABROAD school when theywere thirteeen.

37. People like this film very much. It's both ( excite) EXCITING and (amuse)...amusing.....

38. My sister has alot of ( wood) WOODEN toys, they are very nice

39. I don't believe Tom. He's a terrible ( lie) LIAR

40. It was rather ( child) CHILDISH of him to cry when he did badly in the test

41. I will remember that journey. It was an ( forget) UNFORGETABLE experience

42. Toaster is a kitchen ( apply) APPLIANCE that cooks food.

43. ( Industry)INDUSTRIALIZATION in viet nam has brought a lot of big changes

44. After taking an asprin, her headache ( appear)DISAPPEARED

45. The ( perform) PERFORMANCE she gave last night was marvelous

46. The ( land) LANDSCAPE in his province is very dramatic

47. ( luck) UNLUCKILY , the barber cut my hair too short.

48. nam is very ( social) SOCIABLE , kind and generous

49. Some people think that smoking is ( harm) HARMLESS

1 ( lucky) ....unluckily........I forgot my book at home
2. He learns how to repair (house).......household.....appliances
3. American students take part in different ( act) ...ativities.....at recess
4. He is a ( home) .....homeless........child
5. John is the (happy).......happiest........person that we known
6. Nam doesn't read as ( quick).....quickly......as her sister
7. Birthday is one of the family ( celebrate) ....celebration.........
8. It was a ( beauty) beautiful song and she rang vẻy ( beauty)....beautifully.......
9. Nam is the (good ).......best...student in his class
10. You don't need do this exercise it is ( important )....unimportant........
11. His sudden ( die) ......death...........must be ashock to you
12. He is bored because of the ( understand).......misunderstanding......between him and his friends
13. An orphan is a ( parent)......parentless........child
14. The play is ( bore) ...boring.....so I'm very ( bore)...bored......
15. I hope our ( friend)....friendship......is forever
16. She looks ( friend)......unfriendly..........so I'm afraid
17. His ( happy)....happiness........also makes me happy
18. He is sad because his exam is ( success).unsuccessful........
19. I didn't know his ( important).....importance......
20. I believe you. You are ( truth).......truthful...
21. Steam engine is a important (invent)...invention......The ( invent)inventor is Jame Watt
22. My father is a ( science)...scientist......
23. He has a lot of ( music)..musical..........intrusments
24. Today our (live)..life...........becomes more comfortable
25. Be ( care)...careful..........when you open the door
26. I hope we have ( sun)....sunny.........weather for our holidays
27. May I introdue my ( young)...younger......sister?
28. ( lucky ).....luckily.....we have passed the examination
29. This lilkmaid is the (good).best.....worker on thier farm
30. The museum is the ( far)..farther....away of the two building
31. We must take ( act).action..before things get worse
32. Conan Doyle was famous as the ( creat)..creator..of the great detective Sherlock Holme
33. New car is more ( economy)..econimical....than the one t had before
34. Working on the car make my hands ( grease )...greasy........
35. The weather in this country is so ( predict).unpredictable...that you never know what to expect.
36.Mai and her brother were sent to ( board).boarding.......school when theywere thirteeen.
37. People like this film very much. It's both ( excite)..exciting....and (amuse)...amusing......
38. My sister has alot of ( wood)....wooden.....toys, they are very nice
39. I don't believe Tom. He's a terrible ( lie)........liar.............
40. It was rather ( child).....childish.....of him to cry when he did badly in the test
41. I will remember that journey. It was an ( forget)....unforgettable......experience
42. Toaster is a kitchen ( apply)....appliance....that cooks food.
43. ( Industry)....industry........in viet nam has brought a lot of big changes
44. After taking an asprin, her headache ( appear)...disappeared....
45. The ( perform).........performance...........she gave last night was marvelous
46. The ( land)....landscape.....in his province is very dramatic
47. ( luck).unluckily....., the barber cut my hair too short.
48. nam is very ( social)....sociable......, kind and generous
49. Some people think that smoking is ( harm).....harmless......

đây đâu phải là toán

1. Mickey
2. Vịt kô bị wè thì đi bằng 2 chân.
3. Con người.
4. Con hổ kô ăn cỏ.
5. 12 tháng
6. tên Nam
7. Vào bóng.
8. Ống hút.
9. 1 chữ C
10. “Mày chết rùi hả?” – “Cho tao hun người iu mày nhé”?
11. Vất cây thước đi, cầm compa lên vẽ.
12. Rờ cùi chỏ tay phải.
13. Quan tài.
14. Bạn thấy ai nhắm 2 mắt bắn súng chưa?
15. chính.
16. Ba + n = Bố + n
17. Thứ nhì.
18.Cuối cùng.
19. Doremon
20. Kon nào cũng sợ.
21. Ông Thọ.
22. Bóng con voi
23. Tiếng kêu với đẻ mèo kon.
24. Dao chặt nc đá, cây cưa, bồ cào…
25. luộc
26.Hỏi A gọi Z bằng gì ???
Mồm
27. Ko có chân mày
28. 2 Wả.
29. 9 người.
33. 70.31. We diêm.
32. 9^9.33. cho đông thành đá.
34. Sư tử chết đói rùi.
35. Than.
36. Hôm wa, hôm nay, ngày mai, ngày mốt, ngay kia, ngày nọ
37. Nhà nước.
38. ba; tư.
39. Đánh vần chữ có.
40. Tất cả các loài vì nhà ko biết nhảy.
41. rùa và ốc sên.
42. Ứ biết nấu chín.
43. Con rết bị đau chân.
44. mua số nhà.
45. Cái áo.
46. kon ngựa.
47. mở mắt.
48. kon teem.
49. Nam sẽ lượm dép chạy ko kịp vì Nam ứ phải chủ của chúng.
50. mẹ.
51. ngủ đêm.
52. kái ghế.
53. Con gái>thần tiên>tiền thân>trước khỉ>Mùi>con dê.
54. Đánh cờ.
55.- Anh hãy đếm xem trong giỏ có bao nhiêu cây bắp thì khắc biết tên tôi.
Người có đếm được 12 cây bắp,hỏi cô gái đó tên gì?
Tố Nga.
56. Thanh Kiều.

đây là đố vui hay là toán ?

\(x+1-5⋮x+1\)

\(\Rightarrow5⋮x+1\)

\(\Rightarrow x+1=1;5;-1;-5\)

Đến đây thì dễ rồi tự lập bảng rồi tính