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17 tháng 2 2022

\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)

PTHH: C2H4 + Br2 --> C2H4Br2

           0,05<--0,05

=> \(\%V_{C_2H_4}=\dfrac{0,05.22,4}{4,48}.100\%=25\%\)

\(\%V_{CH_4}=100\%-25\%=75\%\)

17 tháng 2 2022

cho em hoi la 160 la o dau a

1 tháng 3 2017

1.The stomachache prevented Mr.Thanh from enjoying the meal.

2.Mrs.Oanh is a good cook.

3.You don't have to finish all the work today.

4.He drives slower and more careful than I do.

5.It takes the boy 3 hours a day to learn the lesson.

6.He liked oranges than durians.

7.One of the greatest football player in the world is Zidane.

8.Why were you absent from class last Monday?

9.The exam was not difficult as we thought.

10.The visitor spoke too quick for me to understand what he said.

14 tháng 8 2023

Em ghi lại đề đầy đủ, chính xác mới làm được!

14 tháng 8 2023

em ghi lai r do a

 

5 tháng 12 2016

1.How does your dad go to work ?

2. Where does she rode her bike ?

3. What should I do when I hava toothache ?

4. Is there any butter in the fridge ?

5. When are they going to BaNa Hill ?

5 tháng 12 2016

1 How does your dad go to work?

2. Where does she rode her bike ?

3. what shoild I do when I hava toothache?

4 Is there any butter in the fridge?

5 When are they going to BaNa Hill ?

17 tháng 12 2016

II.

1 - c. catches

2 - a. obey

3 - c. look

4 - b. takes

5 - a. cycling

 

 

17 tháng 12 2016
  1. C
  2. A
  3. C
  4. B
  5. A
19 tháng 12 2016

1. Mrs. Nga’s house / hospital / 10km / travel / motorbike.
S1: How far is it from Mrs. Nga's house to the hospital ?
S2: It's ten kilometers.
S1: How does she travel to work ?
S2: She travels by motorbike.

2. Your house / university / 400m / walk.
S1: How far is it from your house to the university ?
S2: It is four hundred meters.
S1: How do you travel to the university ?
S2: I walk there.

3. Lien and Lan’s house / uncle’s farm / 5km / cycle.
S1: How far is it from Lien and Lan's house to your their uncle's farm ?
S2: It is five kilometers.
S1: How do they go there ?
S2: They go by bike.