\(n=\frac{100 \times 10^{3} \times 2000 \times 10^{-6}}{\frac{25}{3} \times 300}\)
\(n=80 \times 10^{-3}\)
\(n_{1}+n_{2}=0.08\)
\(n_{1} \times 2+n_{2} \times 32=0.76\)
\(\left(0.08-n_{2}\right) 2+n_{2}(32)=0.76\)
\(n_{2}=0.02\)
\(n_{1}=0.06\)
\(\frac{n_{1}}{n_{2}}=\frac{3}{1}\)
$[k_B\, = 1 .4\times10^{-23}\,J/K;\, m_{He}\, = 7\times10^{-27}\,kg]$