1. In my family, children has to get permission before leaving the dinning table.

=> In my family, children have to get permission before leaving the dinning table.

2. When I came, the whole family  is having dinner around a big dinning table

=> When I came, the whole family was having a dinner around a big dinning table.

3. Lang Lieu couldn't buy any special food while he was very poor.

= > Lang Lieu couldn't buy any special food when he was very poor.

4. When you visit temple in Thailand, you have to following some important customs.

=> When you visit a temple in Thailand, you have to follow some important customs.

5. People should to lower their voice inside the temple.

=> People should lower their voice inside the temple.

1. - đơn chất: H₂ 

    - hợp chất:H₂O,C₁₂H₂₂O₁₁,Al₂O₃,CaCO₃,CO₂

2. 

3. 

a) PTK(CO₂): 12+16\(\times\)2 =44 đvC

b) PTK(H₂SO₄): 1\(\times\)2+32+16\(\times\)4 =98 đvC

c) PTK(CuSO₄): 64+32+16\(\times\)4 =160 đvC 

a)V\(_{H_2}\)=0,35 x 22,4=7,84(lít)

b)n\(_{CO_2}\)=\(\frac{15,84}{44}\)=0,36(mol)

V\(_{CO_2}\)=0,36 x 22,4 =8,064(lít)

e)n\(_{SO_2}\)=\(\frac{55,04}{64}\)=0,86(mol)

V\(_{SO_2}\)=0,86 x 22,4=19,264(lít)

Còn 2 câu kia tôi chịu

jhbk,hjukjhkjljljklkj

a)n\(_{Cu}\)=\(\frac{m}{M}\)=\(\frac{9,6}{64}\)=0,15(mol)

b)n\(_{CaCO_3}\)=\(\frac{m}{M}\)=\(\frac{10}{100}\)=0,1(mol)

c)n\(_{H_2SO_4}\)=\(\frac{19,6}{98}\)=0,2(mol)

d)n\(_{Ba}\)=\(\frac{30,14}{137}\)=0,22(mol)

TL

a) n = 9,6 : 64 = 0,15 (mol)

b) n = 10 : 100 = 0,1 (mol)

c) n = 19,6 : 98 = 0,2 (mol)

d) n = 30,14 : 137 = 0,22 (mol)

Khi nào rảnh vào kênh H-EDITOR xem vid nha!!! Thanks!

Chịu

Chả biết

Hoho nha bạn

b/ \(M_A=2,207.29=64,003g/mol\)

3/ \(M_A=17.2=34g/mol\)

\(n_A=5,6:22,4=0,25mol\)

\(m_A=0,25.34=8,5g\)

Mình còn nè