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PTHH: \(SO_2+2KOH\rightarrow K_2SO_3+H_2O\)

Ta có: \(n_{SO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\) \(\Rightarrow n_{KOH}=0,1\left(mol\right)\)

\(\Rightarrow C_{M_{KOH}}=\dfrac{0,1}{0,1}=1\left(M\right)\)

30 tháng 7 2021

cảm ơn bạn nha 

10 tháng 7 2021

cảm ơn bn khánh an nha

21 tháng 8 2021

Bài 1 : 

a) Khí đó là $SO_2$
$Na_2SO_3 + H_2SO_4 \to Na_2SO_4 + SO_2 + H_2O$

b) Dung dịch đó là $CuSO_4$
$CuO + H_2SO_4 \to CuSO_4 + H_2O$

c) Dung dịch đó là $Fe_2(SO_4)_3$
$Fe_2O_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 3H_2O$
$2Fe(OH)_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 6H_2O$

d) Dung dịch đó là : $Al_2(SO_4)_3$

$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$

21 tháng 8 2021

Bài 2 : 

a) 

$FeO + 2HCl \to FeCl_2 + H_2O$
$MgO + 2HCl \to MgCl_2 + H_2O$
b)

$SO_2 + KOH \to KHSO_3$

$CO_2 + KOH \to KHCO_3$
c)

$SO_2 + H_2O \rightleftharpoons H_2SO_3$
$CO_2 + H_2O \rightleftharpoons H_2CO_3$

4 tháng 2 2022

\(CO_2+2KOH\rightarrow K_2CO_3+H_2O\)

\(n_{CO_2}=\frac{0,6}{22,4}=\frac{3}{112}mol\)

\(n_{KOH}=2n_{CO_2}=\frac{3}{56}mol\)

\(CM_{KOH}=\frac{3}{56}:\frac{100}{1000}\approx0,356M\)

PTHH: \(CO_2+Ba\left(OH\right)_2\rightarrow BaCO_3\downarrow+H_2O\)

Ta có: \(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)=n_{Ba\left(OH\right)_2}=n_{BaCO_3}\)

\(\Rightarrow\left\{{}\begin{matrix}C_{M_{Ba\left(OH\right)_2}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\\m_{BaCO_3}=0,2\cdot197=39,4\left(g\right)\end{matrix}\right.\)

23 tháng 7 2021

nCO2\(\dfrac{4,48}{22,4}=0,2mol\)

a) CO+ Ba(OH)2 → BaCO3 + H2O

b) Theo pthh : nBa(OH)2=nCO2=0,2 mol

CM Ba(OH)2=\(\dfrac{0,2}{0,4}=0,5M\)

c) nBaCO3 =  nCO2 = 0,2 mol

mBaCO3 = 0,2.197=39,4g

có ai biết làm bài này k giúp mình với mình đang cần rất rất gấp mong các bạn giúp cho.I/ Change the following sentences from active into passive form. 1. Somebody has taken my briefcase.=>……………………………………………………………2. The teacher returned our written work to us.=>………………………………………………….3. She had finished her report by soon.=>…………………………………………………………….4. The police have arrested five suspects.=>………………………………………………………….5. The doctor ordered him to take a long...
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có ai biết làm bài này k giúp mình với mình đang cần rất rất gấp mong các bạn giúp cho.

I/ Change the following sentences from active into passive form.

1. Somebody has taken my briefcase.=>……………………………………………………………

2. The teacher returned our written work to us.=>………………………………………………….

3. She had finished her report by soon.=>…………………………………………………………….

4. The police have arrested five suspects.=>………………………………………………………….

5. The doctor ordered him to take a long rest.=>…………………………………………………………

6. A group of students have met their friends at the rail way station.

=>……………………………………………………………………..

7. They didn’t allow Tom to take these books home.

=>……………………………………………………………..

8. The teacher won’t correct exercises tomorrow.

=>……………………………………………………………….

9. Marry has operated Tom since 10 o’clock.

=>……………………………………………………………….

10. They didn’t look after the children properly.

=>……………………………………………………………..

11. Nobody swept this street last week.=>…………………………………………………

12. People speak English all over the world.

=>……………………………………………………………

13. Tom was writing two poems.=>…………………………………………………

14. She often takes her dog for a walk.=>…………………………………………………

15. They can’t make tea with cold water.=>…………………………………………………

16. The chief engineer was instructing all the workers of the plan.

=>…………………………………………………………………….

17. Somebody has taken some of my book away.

=>……………………………………………………….

18.. They will hold the meeting before the May Day.

=>………………………………………………………………

19. The boys broke the window and took away some pictures.

=>…………………………………………………………………….

20. People spend a lot of money on advertising everyday.

->……………………………………………………………………..

II. Choose the best answer

1.I come from Canada. Where .................you..................from?

a. do.............come         b. did ...... come     c. are ..........coming        d, have .....come

2. The telephones…………..by Alexander Graham Bell

A. is invented                 B. is inventing                C. Invented           D. was invented

3. The swimming pool .............. at 9 o’clock and ............ at 18.30 everyday.

a. opens............. closes   b. opens ...... closed      c. opened...... closed    d. opened......... closes

4. Three swimmers, Paul, Ed, and Jim, ................ now in competition  for medals.

a. is                       b. has been                      c. had been            d. are

5. Listen ! I .............. somebody knocking at the front door. 

a. am hearing         b. heard                          c. have heard         d. hear

6.. ………………………………………..yet?

A. Have the letters been typed            B. Have been the letters typed

C. Have the letters typed                    D. Had the letters typed

7. At 5 o’clock yesterday evening, I ……………my clothes.

a. am ironing         b. have ironed       c. ironed               d. was ironing.

8. I ………………..along the street when I suddenly heard footsteps behind me.

a. was walking      b. am walking        c. walk                            d. walked.

9. She ………….German for two years.

a. has learnt           b. is learning         c. learn        d. learns.

10. When  I last………..Jane, she ………..to find a job.

a. see/was trying    b. saw/was trying c. have seen/tried            d. saw/tried.

12. French is a…………language to learn than English is.

        A. difficult      B. more difficult       C. most difficult        D. more and more difficult

13. The more polluted air we breathe,…….we get.

          A. the more weaker                  B. the more weak

          C. the weaker                           D. weaker more

14. The more we study, the……we are.

          A. more good                 B. better               C. better than        D. good

15. The more I tried my best to help her, ……….she became.

          A. less lazy                     B. the lazier           C. the more lazy    D. lazier

16. The weather becomes………………

          A. colder with colder                                   B. colder and colder

          C. colder and more colder                            D. more and more cold

17. The more he slept,…………….irritable he became.

          A. the most                     B. the vey more     C. much more       D. the more

18. ………..he worked, the more he earned.

          A. The more hard           B. The hard           C. The harder        D. The hardest

19. ………I get to know Jim, the more I like him.

          A. For more                    B. More                C. The more D. The most

20. The competition makes the price of goods……….

          A. most cheap and cheap                    B. cheaper and cheaper

          C. more cheap and more cheap           D. cheaper and more cheaper

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có ai biết làm bài này k giúp mình với mình đang cần rất rất mong các bạn giúp cho..V. Sử dụng thì hiện tại đơn hoặc thì hiện tại tiếp diễn trong những câu sau1.  She ........................................ (play) tennis every Sundays.2. The students (not, be).........................in class at present.3. The children (play)........................... in the park at the moment.4.  He ........................................ (buy) a cup of coffee every...
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có ai biết làm bài này k giúp mình với mình đang cần rất rất mong các bạn giúp cho.

.

V. Sử dụng thì hiện tại đơn hoặc thì hiện tại tiếp diễn trong những câu sau

1.  She ........................................ (play) tennis every Sundays.

2. The students (not, be).........................in class at present.

3. The children (play)........................... in the park at the moment.

4.  He ........................................ (buy) a cup of coffee every morning.

5.  Julie ........................................ (come) from Russia .

6. Jack and Peter  (work) ________ late today.

7.  Luke ........................................ (usually /study) hard to be polite.

8.  She ........................................ (enjoy) going swimming twice a week.

9. The weather (get) ________ cold this season.

10. My children (be)_____ upstairs now. They (play)______ games.

 11.  Lucy ........................................ (wash) her hair every day

12.  John never ........................................ (cry).

13.  My mother always ........................................ (say) that love is more important than money.

14.  Julie ........................................ (pass) the exam once a year.

15. The sun ........................................ (rise) in the East.

..................................................

 

1
11 tháng 8 2021

V. Sử dụng thì hiện tại đơn hoặc thì hiện tại tiếp diễn trong những câu sau

1.  She ................plays........................ (play) tennis every Sundays.

2. The students (not, be).........aren't................in class at present.

3. The children (play)...................are playing........ in the park at the moment.

4.  He ............................buys............ (buy) a cup of coffee every morning.

5.  Julie ...........................comes............. (come) from Russia .

6. Jack and Peter  (work) ____work____ late today.

7.  Luke ...........................usually studies............. (usually /study) hard to be polite.

8.  She ...............................enjoys......... (enjoy) going swimming twice a week.

9. The weather (get) __gets______ cold this season.

10. My children (be)___are__ upstairs now. They (play)_are playing_____ games.

 11.  Lucy ......................washes.................. (wash) her hair every day

12.  John never ........cries................................ (cry).

13.  My mother always .............says........................... (say) that love is more important than money.

14.  Julie .....passes................................... (pass) the exam once a year.

15. The sun .................rises....................... (rise) in the East.

..................................................

11 tháng 8 2021

cảm ơn anh nhiều 

 

22 tháng 7 2021

a) \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)

b) \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

Theo PT: \(n_{NaOH}=2n_{CO_2}=0,1\left(mol\right)\)

=> \(CM_{NaOH}=\dfrac{0,1}{0,1}=1M\)

c) Sửa đề DNaOH = 1,2g/ml

 \(m_{ddsaupu}=0,05.44+100.1,2=122,2\left(g\right)\)

\(n_{Na_2CO_3}=n_{CO_2}=0,05\left(mol\right)\)

=> \(C\%_{Na_2CO_3}=\dfrac{0,05.106}{122,2}.100=4,34\%\)