Question

 Hãy cân bằng các phương trình hóa học sau: (3,0 điểm)

                 a/        Fe      +    O2             Fe3O4

                 b/        P        +    O2             P2O5

                 c/        Na      +    O2             Na2O

                 d/       Al       +     HCl          AlCl3     +     H2

                 e/        C2H4   +     O2            CO2      +     H2O

                 f/        Fe(OH)3    +     H2SO4          Fe2(SO4)3   +    H2O   

Answer 1

a) \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

b) \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)

c) \(4Na+O_2\underrightarrow{t^o}2Na_2O\)

d) \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

e) \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

f) \(2Fe\left(OH\right)_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\)

Answer 2

\(a,3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

\(b,4P+5O_2\underrightarrow{t^o}2P_2O_5\)

\(c,4Na+O_2\underrightarrow{t^o}2Na_2O\)

\(d,2Al+6HCl\rightarrow2AlCl_3+3H_2\)

\(e,C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

\(f,2Fe\left(OH\right)_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\)