I love my family because they are important to me.In my opinion,a happy family is everybody together share sad and happy .Parents alwways sociable and siblings love each other.Family together go to the travel in country.

Happy new year

Người ta thường đốt bột lưu huỳnh tạo ra khí X “xông” cho đông dược để bảo quản đông dược được lâu hơn. Công thức của khí X là

A. NO. 

B. H₂S

C. CO₂

D. SO₂

a)3FE+2O\(_2\)---->Fe3O4

b)đã cân bằng

c)H3PO4+3NaOH---->Na3PO4+3H2O

d)2FeCl2+Cl2------>2FeCl3

e)2SO2+O2------>2SO3

CH\(_4\)+2O\(_2\)->CO\(_2\)+H\(_2\)O

nCH4=_{\(\frac{1,12}{22,4}\)=0,05(mol)}

_{nO2 =2CH4=2.0,05=0,1(mol)}

_{VO2 (đktc)=0,1.22,4=2,24(l)}

_{nCO2=nCH4=0,05(mol)}

_{VCO2=0,05.22,4=1,12(l)}

_{nH2O=2nCH4=0,05.2=0,1(mol)}

mH2O=0,1.18=1,8(g)

4M +3O2 ->2M2O3 (1)

nO2=\(\frac{3,36}{22,4}\)=0,15( mol)

theo (1) nM203 =\(\frac{2}{3}\)nO2 =\(\frac{2}{3}\)*0,15=0,1(mol)

M của M2O3=\(\frac{10,2}{0,1}\)=102(g/mol)

PTK(M2O3)=2M+48=102

=>M=27

Vậy M là nhôm(Al)

Next month ,my family will prepare for Tet holiday.Before Tet,we will decorate our house .I am going to buy a lot of new clothes.During Tet ,i am going to the pagoda .in the summer,i will to the visiting my grandparent in Da Nang.My vacation will take 2 weeks.after that,i will come back home to prepare for my next school year

D = 3¹⁰-3⁹+3⁸-3⁷+....+3²-3¹

3D = 3¹¹-3¹⁰+3⁹-3⁷+...+3³-3²

4D = 3D + D = 3¹¹-3¹

=> D = \(\frac{3^{11}-3}{4}\)