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Tham khảo:

$\begin{array}{l} 1)C:Cacbondioxit;Natriclorua;Canxicacbonat;Dihidroxit(Hop\ chat\ duoc\ tao\ boi\ hai\ nguyen\ to\ tro\ len)\\2)A:N_2^{Oxi:II}O^{Nito:I}\\CT:N_x^IO_y^{II}\\→x.I=y.II\\→\dfrac{x}{y}=\dfrac{II}{I}→N_2O\\3)C:Mg:II;Clo:I→Mg^{Cl:I}Cl_2^{Mg:II}\\CT:Mg_x^{II}Cl_y^I\\→x.II=y.I\\→\dfrac{x}{y}=\dfrac{I}{II}→MgCl_2\end{array}$