Ta có a) ZnCl2 quy tắc hóa trị -> x.1=I.2->x=II Vậy Zn hóa trị 2

CuCl ->QTHT->x.1=1.I=>x=I vậy Cu hóa trị I

AlCl3->QTHT=>x.1=3.I=>x=III => Vậy Al hóa trị III

b FeSO4 => QTHT (Ta có SO4 hóa trị II )=>x.1=II.1=>x=II =>Vậy Fe hóa trị II

Tham khảo hình ảnh ạ!

Không thấy ảnh = ib.

Cre : H.vn

a. PTHH: \(2SO_2+O_2\rightarrow^{t^o}_{V_2O_5}2SO_3\) (đoạn này Latex OLM đánh nhiều hơi rối nên không hiểu thì hỏi nhé)

\(SO_3+H_2O\rightarrow H_2SO_4\)

\(300ml=0,3l\)

\(\rightarrow n_{H_2SO_4}=1.0,3=0,3mol\)

Theo phương trình \(n_{O_2}=n_{SO_3}=n_{H_2SO_4}=0,3mol\)

\(\rightarrow m_{SO_2}=64.0,3=19,2g\)

b. PTHH: \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

\(n_{Al_2O_3}=\frac{15,3}{102}=0,15mol\)

Xét tỉ lệ \(n_{Al_2O_3}>\frac{n_{H_2SO_4}}{3}\)

Vậy \(Al_2O_3\) dư

Theo phương trình \(n_{Al_2\left(SO_4\right)_3}=\frac{1}{3}n_{H_2SO_4}=0,1mol\)

\(\rightarrow C_{M_{Al_2\left(SO_4\right)_3}}=\frac{0,1}{0,3}=0,33M\)

1 , in -> on

2 , Do -> Does

3 , tower -> towers

4 , city -> cities

5 , is -> are

6 , more busy -> busier 

7 , big -> bigger

8 , do -> does

9 , at -> in

10 , because -> so

Exercise 2 . Underline one mistake in each sentence and correct it.

1. I live on  the twenty-one  floor of City Tower.

=> in

2. Do your brother  live in a small house?

=> Does 

3. There are two high tower  near my house.

=> towers

4. Ha noi is one of the most beautiful city in Viet Nam.

 => cities 

5. These cities is large and busy.

=> are

 6. Living in a big city is  more busy than living in the countryside.

=> busier 

7.  This building is big than that one.

=> bigger

8. What do your hometown ? – it is beautiful.

=> does

9. My best friend, Lisa s living at the mountains.

=> in

10. It is a nice and big  city, because I want to live there.

=>  so

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\(NTK_X=16.8,5=136đvC\)

Vậy không có nguyên tố X thoả mãn

\(NTK_X=16\cdot8,5=136dvC\)

Vậy không có số nguyên tố X thỏa mãn

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