A 10 g mixture of hydrogen and helium is contained in a vessel of capacity 0.0125 m^3 at 6 bar and 27^° C. The mass of helium in the mixture is \ \ \…

A $\displaystyle 10$ g mixture of hydrogen and helium is contained in a vessel of capacity $\displaystyle 0.0125 \mathrm{~m}^3$ at $\displaystyle 6$ bar and $\displaystyle 27^{\circ} \mathrm{C}$. The mass of helium in the mixture is \_\_\_\_ g. (nearest integer) Given: $\displaystyle \mathrm{R}=8.3 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ (Atomic masses of H and He are $\displaystyle 1$ u and $\displaystyle 4$ u , respectively)