1.0 litre of ${\mathrm{N}}_2$ and 7/8 litre of ${\mathrm{O}}_2$ at the same temperature and pressure were mixed together. What is the relation between the masses of the gases in the mixture?

1.0 litre of ${\mathrm{N}}_2$ and 7/8 litre of ${\mathrm{O}}_2$ at the same temperature and pressure were mixed together. The relation between the masses of the gases in the mixture is :

$M_{{\mathrm{N}}_2}=\frac{1}{k}\times 28$

$M_{{\mathrm{o}}_2}=\frac{7}{8k}\times 32$

$\Rightarrow M_{{\mathrm{N}}_2}=M_{{\mathrm{O}}_2}$