\begin{aligned} & \mathrm{O}_2+\mathrm{Ne} \\ & \mathrm{X}_{\mathrm{gm}} 200 \mathrm{gm} \\ & \mathrm{P}_{\text {total }}=25 \mathrm{bar} ; \mathrm{P}_{\mathrm{Ne}}=20 \\ & \mathrm{P}_{\mathrm{O}_2}+\mathrm{P}_{\mathrm{Ne}}=25 \\ & \mathrm{P}_{\mathrm{O} 2}=25-20=5 \mathrm{bar} \\ & \quad 5=\frac{\frac{\mathrm{x}}{32}}{\frac{\mathrm{x}}{32}+\frac{200}{20}} \times 25 \\ & \quad \frac{1}{5}=\frac{\frac{\mathrm{x}}{32}}{\frac{\mathrm{x}}{32}+10} & \frac{1}{5}=\frac{x \times 32}{32(x+320)} \\ & 5 x=x+320 \\ & 4 x=320 \\ & x=\frac{320}{4}=80 \mathrm{gm} \end{aligned}