hoàn thành các PTHH sau: (ghi rõ ĐKXĐ nếu có):

a/Fe+?=>FeCl₃

b/C₂H₆+O₂=>?

từ từ

1.Do they teach English here?

-> Was English taught here?

2.Will you invite her to your wedding party?

-> Will she be invited to your wedding party?

3.Has Tom finished the work?

-> Has the work been finished by Tom?

4.Did the teacher give some exercises?

-> Were some exercises given by the teacher?

5.Have they changed the window of the laboratory?

-> Has the window of the laborator been changed?

6.Is she going to write a poem?

-> Is a poem going to be written?

7.Is she making big cakes for the party?

-> Are big cakes being made for the party?

8.Are the police making inquires about the thief?

-> Are inquires about the thief being made by the police?

9.Must we finish the text before ten?

-> Must the text be finished before ten?

10.Will buses bring the children home?

-> Will the children home be brought by buses?

1. Has Tom finished the work?

=> Has the work been finished by Tom ? 

2. Did the teacher give some exercises ? 

=> Were some excercises given by the teacher ? 

3. Have they changed the window of the laboratory?

=> Has  the window of the laboratory been changed ? 

4. Is she going to write a poem?

=> Is a poem going to be written ? 

1. Has Tom finished the work?

=> Has the work been finished by Tom ? 

2. Did the teacher give some exercises ? 

=> Were some excercises given by the teacher ? 

3. Have they changed the window of the laboratory?

=> Has  the window of the laboratory been changed ? 

4. Is she going to write a poem?

=> Is a poem going to be written ? 

Theo gt ta có: nMg=0,15(mol)nMg=0,15(mol)

a, 2Mg+O2→2MgO2Mg+O2→2MgO

Ta có: nO2=0,5.nMg=0,075(mol)⇒VO2=1,68(l)nO2=0,5.nMg=0,075(mol)⇒VO2=1,68(l)

b, 2KClO3→2KCl+3O22KClO3→2KCl+3O2 (đk: nhiệt độ, MnO2)

Ta có: nKClO3=2/3.nO2=0,05(mol)⇒mKClO3=6,125(g)

đúng mà mn

hay vl