[tex]\text{Se calculeaza masele molare:}\\
\mu_{N_2}=2\cdot A_N=28\ g/mol\\
\mu_{O_2}=2\cdot A_O=32\ g/mol\\
\text{Se aplica formula:}
\dfrac{m}{\mu}=\dfrac{N}{N_A}\Rightarrow m=\frac{N\cdot \mu}{N_A}\\
\text{Pentru azot:}m_{N_2}=\dfrac{N_1\cdot \mu_{N_2}}{N_A}=calcule=56 g\\
\text{Pentru oxigen:}m_{O_2}=\dfrac{N_2\cdot \mu_{O_2}}{N_A}=calcule=21,3 g\\
Apoi:\\
\nu=\nu_1+\nu_2\\
\dfrac{m_{O_2}+m_{N_2}}{\mu}=\dfrac{m_{O_2}}{\mu_{O_2}}+\dfrac{m_{N_2}}{\mu_{N_2}}\\
\text{Si de aici afli}\ \mu -ul.[/tex]