Vì khí CO2 nặng hơn không khí 1,52 lần nên khí CO2 thường tích tụ trong đáy giếng khơi, trên nền hang sâu.

Vì khí CO2 nặng hơn không khí 1,52 lần nên khí CO2 thường tích tụ trong đáy giếng khơi, trên nền hang sâu.

mik cũng ko bt đúng hay sai

Zn + 2HCl -> ZnCl₂ + H₂

a)n_Zn=\(\frac{13}{65}\)=0,2(mol)

Theo PTHH ta có:

n_H2=n_Zn=0,2(mol)

n_HCl=2n_Zn=0,4(mol)

b)V_H2=22,4.0,2=4,48(lít)

c)m_HCl=36,5.0,4=14,6(g)

\(C+O_2->CO_2\)

chất pư là cacbon và oxi

\(2K+2H_2O->2KOH+H_2\)

chất pư gồm kali và nước

1.has=>have

2.is=>was

3.was=>was being

4.following=>follow

5.to lower=>lower

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!