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20 tháng 7 2020

\(n_{H_2SO_4}=1,8\left(mol\right);n_{Ni}=0,16875\left(mol\right)\)

Đặt \(n_{F\text{e}}=x;n_{Cu}=y;n_{c\text{r}}=z\left(mol\right)\)

TN1: Cho Y td H2SO4

Fe3O4 + 8H+ -----> 2Fe3+ + Fe2+ + 4H2O

\(\frac{1}{3}x\)\(_{\rightarrow}\)______\(\frac{8}{3}x\)______\(\frac{2}{3}x\)_____\(\frac{1}{3}x\)

CuO + 2H+ -----> Cu2+ + H2O

y\(_{\rightarrow}\)______2y_______y

Cr2O3 + 6H+ -----> 2Cr3+ + 3H2O

0,5z\(_{\rightarrow}\)____3z________z

\(\Rightarrow n_{H^+}=\frac{8}{3}x+2y+3\text{z}=3,6\left(1\right)\)

TN2: Cho \(\frac{1}{4}\)Z td Ni

Ni + 2Fe3+ -----> Ni2+ + 2Fe2+

\(\frac{1}{12}x\)__\(_{\leftarrow}\frac{1}{6}x\)

Ni + Cu2+ -----> Ni2+ + Cu

\(\frac{y}{4}\)____\(_{\leftarrow}\frac{1}{4}y\)

\(\Rightarrow\frac{1}{12}x+\frac{1}{4}y=0,16875\)

\(\Rightarrow m_{KL}=56\text{x}+64y+52\text{z}=\frac{52}{3}\left(\frac{8}{3}x+2y+3\text{z}\right)+\frac{352}{3}\left(\frac{x}{12}+\frac{y}{4}\right)=82,2\left(g\right)\)

TN3: Cô cạn 3 phần còn lại

mchất rắn \(=\frac{3}{4}\left(m_{KL\left(Z\right)}+m_{SO_4^{2^-}\left(Z\right)}\right)=\frac{3}{4}\left(82,2+96\cdot1,8\right)=191,25\left(g\right)\)

20 tháng 7 2020

True đấy nhưng về cách trình bày đừng doạ tao bằng ion mày ơi :)) Thu gọn ion thì thu gọn cho trót là O2-+H+ đi còn CuO+H+ :3

12 tháng 3 2022

2. stomachache

3. begin

4. computer

12 tháng 3 2022

2. Stomachache

3. Begin

4. Computer

14 tháng 12 2016

60

2 tháng 8 2023

1. The second question was more difficult than the first one

2. The brown coat is bigger than the black one

3. The sofa is more comfortable than the chải

4. Jack's suitcase was hevier than Jim's suitcase 

D
datcoder
CTVVIP
18 tháng 11 2023

What phrase does the writer use to

(Tác giả dùng cụm từ nào để)

1 introduce the first argument for?

(giới thiệu luận cứ ủng hộ đầu tiên?)

Đáp án: “It is certainly true that”

(Đó chắc chắn là sự thật rằng)

2 introduce the second argument for?

(giới thiệu luận cứ ủng hộ thứ hai?)

Đáp án: “It is also undeniable that”

(Cũng không thể phủ nhận rằng)

3 introduce the first argument against?

(giới thiệu luận cứ phản đối đầu tiên?)

Đáp án: “On the other hand”

(Mặt khác)

4 introduce the second argument against?

(giới thiệu luận cứ phản đối thứ hai?)

Đáp án: “Another problem is that”

(Còn một vấn đề nữa là)

5 begin the conclusion?

(bắt đầu kết luận?)

Đáp án: “On balance”

(Xét cho cùng)

II. Choose the best answer 1 Nam is___the most successful student in my class (so long/by how/by far/so now) 2 Karachi is___city in the word population (the two largest/the two larger/the second largest/the second larger) 3 The city has recently set___a library in the West Suburb (set up/off/in/out) 4 I don't think Fred gets___ with Daniel. They always argue (over/up/thought/on) 5 Mike had to___gymnastic because of his injury (look up/give up/keep up with/put up with) 6 I'm going crazy! I...
Đọc tiếp

II. Choose the best answer
1 Nam is___the most successful student in my class (so long/by how/by far/so now)
2 Karachi is___city in the word population (the two largest/the two larger/the second largest/the second larger)
3 The city has recently set___a library in the West Suburb (set up/off/in/out)
4 I don't think Fred gets___ with Daniel. They always argue (over/up/thought/on)
5 Mike had to___gymnastic because of his injury (look up/give up/keep up with/put up with)
6 I'm going crazy! I can't___so much confusion (look up/give up/keep up with/put up with)
7 This museum has many unique artefacts___it is small (because/in order that/ when/although)
8 ___she's young, she's the most famous artisan in the village (when/although/whereas/in order to)
9 Choose the word whose underlined part is pronounced differently from the others
   A. washed         B. watched
   C. stopped         D. played
10 Choose the word which is stressed differently from the rest
    A. craftsmen       B. attraction
    C. remind          D. enjoy

0
II. Choose the best answer 1 Nam is___the most successful student in my class (so long/by how/by far/so now) 2 Karachi is___city in the word population (the two largest/the two larger/the second largest/the second larger) 3 The city has recently set___a library in the West Suburb (set up/off/in/out) 4 I don't think Fred gets___ with Daniel. They always argue (over/up/thought/on) 5 Mike had to___gymnastic because of his injury (look up/give up/keep up with/put up with) 6 I'm going crazy! I...
Đọc tiếp

II. Choose the best answer
1 Nam is___the most successful student in my class (so long/by how/by far/so now)
2 Karachi is___city in the word population (the two largest/the two larger/the second largest/the second larger)
3 The city has recently set___a library in the West Suburb (set up/off/in/out)
4 I don't think Fred gets___ with Daniel. They always argue (over/up/thought/on)
5 Mike had to___gymnastic because of his injury (look up/give up/keep up with/put up with)
6 I'm going crazy! I can't___so much confusion (look up/give up/keep up with/put up with)
7 This museum has many unique artefacts___it is small (because/in order that/ when/although)
8 ___she's young, she's the most famous artisan in the village (when/although/whereas/in order to)
9 Choose the word whose underlined part is pronounced differently from the others
   A. washed         B. watched
   C. stopped         D. played
10 Choose the word which is stressed differently from the rest
    A. craftsmen       B. attraction
    C. remind          D. enjoy

1
23 tháng 10 2021

1 Nam is___the most successful student in my class (so long/by how/by far/so now)
2 Karachi is___city in the word population (the two largest/the two larger/the second largest/the second larger)
3 The city has recently set___a library in the West Suburb (set up/off/in/out)
4 I don't think Fred gets___ with Daniel. They always argue (over/up/thought/on)
5 Mike had to___gymnastic because of his injury (look up/give up/keep up with/put up with)
6 I'm going crazy! I can't___so much confusion (look up/give up/keep up with/put up with)
7 This museum has many unique artefacts___it is small (because/in order that/ when/although)
8 ___she's young, she's the most famous artisan in the village (when/although/whereas/in order to)
9 Choose the word whose underlined part is pronounced differently from the others
   A. washed         B. watched
   C. stopped         D. played
10 Choose the word which is stressed differently from the rest
    A. craftsmen       B. attraction
    C. remind          D. enjoy

Vì ngu anhComplete the second sentence so that it means the same as the first sentence, using the adjective in capitals. 1.     The first question was easier than the second one. (DIFFICULT) The second question _________________________________________ 2.     The black coat is smaller than the brown one. (BIG) The brown coat  ____________________________________________ 3.     The chair isn’t as comfortable as the sofa. (COMFORTABLE) The sofa ...
Đọc tiếp

Vì ngu anh

Complete the second sentence so that it means the same as the first sentence, using the adjective in capitals.

 

1.     The first question was easier than the second one. (DIFFICULT)

 

The second question _________________________________________

 

2.     The black coat is smaller than the brown one. (BIG)

 

The brown coat  ____________________________________________

 

3.     The chair isn’t as comfortable as the sofa. (COMFORTABLE)

 

The sofa  __________________________________________________

 

4.     Jim’s suitcase was lighter than Jack’s suitcase. (HEAVY)

 

Jack’s suitcase  __________________________________________________

 

5.     His homework was better than mine. (BAD)

 

My homework  ____________________________________________

 

6.     The big television is more expensive than the small one. (CHEAP)

 

The small television ________________________________________

 

7.     The Royal Hotel is more old-fashioned than the Holton Hotel. (MODERN)

 

The Holton Hotel ____________________________________________

 

8.     The weather yesterday was worse than it is today. (GOOD)

 

The weather today  __________________________________________

 

9.     People in the city aren’t as friendly as those in the country. (FRIENDLY)

 

People in the country _________________________________________

 

10.            Life in the city is more interesting than life in the country. (BORING)

 

Life in the country  _________________________________________

2
3 tháng 12 2021

Hoàn thành câu thứ hai sao cho nó có nghĩa giống như câu đầu tiên, sử dụng tính từ viết hoa.

 

1. Câu hỏi đầu tiên dễ hơn câu hỏi thứ hai. (KHÓ)

<đây tôi dịch>

3 tháng 12 2021

1.     The first question was easier than the second one. (DIFFICULT)

 

The second question _______was more difficult than the first one__________________________________

 

2.     The black coat is smaller than the brown one. (BIG)

 

The brown coat  __is bigger than the black one__________________________________________

 

3.     The chair isn’t as comfortable as the sofa. (COMFORTABLE)

 

The sofa  ____is more comfortable than the chair______________________________________________

 

4.     Jim’s suitcase was lighter than Jack’s suitcase. (HEAVY)

 

Jack’s suitcase  ___was heavier than Jim's _______________________________________________

 

5.     His homework was better than mine. (BAD)

 

My homework  __was worst than his homework__________________________________________

 

6.     The big television is more expensive than the small one. (CHEAP)

 

The small television ____is cheaper than the big one____________________________________

 

7.     The Royal Hotel is more old-fashioned than the Holton Hotel. (MODERN)

 

The Holton Hotel ______is more modern than the Royal Hotel______________________________________

 

8.     The weather yesterday was worse than it is today. (GOOD)

 

The weather today  _____was better than the weather yesterday_____________________________________

 

9.     People in the city aren’t as friendly as those in the country. (FRIENDLY)

 

People in the country ___are more friendly than people in the city______________________________________

 

10.            Life in the city is more interesting than life in the country. (BORING)

 

Life in the country  ____is more boring than life in the city_____________________________________

Complete the second sentence so that it means the same as the first sentence, using the adjective in capitals.1. The first question was easier than the second one. (DIFFICULT)→The second question _______________________________.2. The black coat is smaller than the brown one. (BIG)→The brown coat ___________________________________.3. The chair isn’t as comfortable as the sofa. (COMFORTABLE)→The sofa_________________________________________.4. Jim’s suitcase was lighter than Jack’s suitcase....
Đọc tiếp

Complete the second sentence so that it means the same as the first sentence, using the adjective in capitals.

1. The first question was easier than the second one. (DIFFICULT)

→The second question _______________________________.

2. The black coat is smaller than the brown one. (BIG)

→The brown coat ___________________________________.

3. The chair isn’t as comfortable as the sofa. (COMFORTABLE)

→The sofa_________________________________________.

4. Jim’s suitcase was lighter than Jack’s suitcase. (HEAVY)

→Jack’s suitcase ___________________________________.

5. His homework was better than mine. (BAD)

→My homework ____________________________________.

6. The big television is more expensive than the small one. (CHEAP)

→The small television ________________________________.

7. The Royal Hotel is more old-fashioned than the Holton Hotel. (MODERN)

→The Holton Hotel __________________________________.

8. The weather yesterday was worse than it is today. (GOOD)

→The weather today _________________________________.

9. People in the city aren’t as friendly as those in the country. (FRIENDLY)

→People in the country _______________________________.

10. Life in the city is more interesting than life in the country. (BORING)

→Life in the country _________________________________.

11. Lam is taller than everyone in my class

→Lam is the _______________________________________.

Làm giúp mình nha! Ai đúng mình tick cho

3
20 tháng 8 2021

1.The second question was more difficult than the first question

2.The brown coat is bigger than the black coat

3.The sofa is more comfortable than the chair

4.Jack's suitcase was heavier than Jim's suitcase

5.My homework was worse than his homework

6.The small television is cheaper than the big one

7.The Holton Hotel is more modern than the Royal Hotel

8.The weather today was better than it is yesterday

9.People in the country are more friendly than those in the city

10.Life in the country is more boring than life in the city

11.Lam is the tallest in my class

20 tháng 8 2021

1 The second question was more difficult than the first one

2 The brown coat is bigger than the black one

3 The sofa is more comfortable than the chair

4 Jack's suitcase was heavier than Jim's suitcase

5 My homework was worse than his homwork

6 The small television is cheaper than the big one

7 The Holton Hotel is more mordern than The Royal Hotel

8 The weather today is better than it was yesterday

9 People in the country is friendlier than those in the city

10 Life in the country is more boring than life in the city

11 Lam is the tallest in my class