\(2Al+3CuSO_4\rightarrow Al_2\left(SO_4\right)_3+3Cu\)
\(2Mg+O_2\underrightarrow{t^o}2MgO\)
Al + 3CuSO4 -> Al(SO4)3 + 3Cu
2Mg + O2 -> 2MgO
6NaOH + Al2(SO4)3 -> 2Al(OH)3 + 3Na2SO4
FeO + H2 -> Fe + H2O
\(6NaOH+Al_2\left(SO_4\right)_3\rightarrow2Al\left(OH\right)_3+3Na_2SO_4\)
\(Fe_xO_y+yH_2\rightarrow xFe+yH_2O\)