nhiều quá

46, Fe+Cu(NO3)2--->Fe(NO3)2+Cu

47, Al+3AgNO3--->Al(NO3)3+3Ag

48, Mg+ZnSO4--->MgSO4+Zn

49, 2Al+3FeCl2--->2AlCl3+3Fe

50, Na2CO3+ZnCl2--->ZnCO3+2NaCl

51, CaCl2+2AgNO3--->Ca(NO3)2+2AgCl

52, MgSO4+K2SO3--->MgSO3+K2SO4

53, Na2S+ZnCl2--->ZnS+2NaCl

54, 2Fe(NO3)3+3K2SO3--->Fe2(SO3)3+6KNO3

55, 2KNO3--->2KNO2+O2

56, 2NaNO3--->2NaNO2+O2

57, CaCO3--->CaO+CO2

58, BaCO3--->BaO+CO2

59, 2KMnO4--->K2MnO4+MnO2+O2

60, 2KClO3--->2KCl+3O2

31, Fe(OH)2+2HCl--->FeCl2+2H2O

32, NaOH+HNO3--->NaNO3+H2O

33, BaSO3+2HNO3--->Ba(NO3)2+SO2+H2O

34, CaCO3+2HCl--->CaCl2+CO2+H2O

35, AgNO3+HCl--->AgCl+HNO3

36, Fe2S3+6HCl--->2FeCl3+3H2S

37, FeSO3+H2SO4--->FeSO4+SO2+H2O

38, 2Al(OH)3--->Al2O3+3H2O

39, 2Fe(OH)3--->Fe2O3+3H2O

40, Zn(OH)2--->ZnO+H2O

41, Mg(OH)2--->MgO+H2O

42, Zn(NO3)2+2KOH--->Zn(OH)2+2KNO3

43, FeCl3+3NaOH---> Fe(OH)3+3NaCl

44, MgSO4+Ca(OH)2--->Mg(OH)2+CaSO4

45, K2CO3+Ba(OH)2--->BaCO3+2KOH

16, Na2O+H2O--->2NaOH

17, K2O+H2O--->2KOH

18, CaO+H2O--->Ca(OH)2

19, BaO+H2O--->Ba(OH)2

20, Al2O3+6HCl--->2AlCl3+3H2O

21, Fe2O3+6HNO3---> 2Fe(NO3)3+3H2O

22, ZnO+H2SO4--->ZnSO4+H2O

23, 3CaO+2H3PO4--->Ca3(PO4)2+3H2O

24, Fe+2HCl--->FeCl2+H2

25, Mg+H2SO4--->MgSO4+H2

26, 2Al+6HCl--->2AlCl3+3H2

27, Zn+H2SO4---->ZnSO4+H2

28, Cu+2H2SO4---> CuSO4+SO2+2H2O

29, Al(OH)3+3HCl--->AlCl3+3H2O

30, Zn(OH)2+H2SO4--->ZnSO4+2H2O

1, CO2+H2O--->H2CO3

2, SO3+H2O--->H2SO4

3, SO2+H2O--->H2SO3

4, N2O5+H2O---> 2HNO3

5, P2O5+3H2O--->2H3PO4

6, SO2+K2O--->K2SO3

7, CO2+BaO--->BaCO3

8, SO3+Na2O--->Na2SO4

9, P2O5+3CaO--->Ca3(PO4)2

10, N2O5+K2O--->2KNO3

11, CO2+2NaOH--->Na2CO3+H2O

12, SO2+Ca(OH)2--->CaSO3+H2O

13, SO3+Ba(OH)2--->BaSO4+H2O

14, N2O5+2KOH--->2KNO3+H2O

15, P2O5+3Ba(OH)2--->Ba3(PO4)2+3H2O

Choose the word that has the underlined part pronounced 

A. dear

B. pear

C. earn

D. heart

CuO+H2--->Cu+H2O

Tỉ lệ: 1:1:1:1

Bài 1

C%= \(\dfrac{8}{100}.100\%=8\%\)

Bài 2

C%= \(\dfrac{5,6}{180}.100\%\approx3,11\%\)