' x ' g of molecular oxygen ( O_2) is mixed with 200 g of neon ( Ne ). The total pressure of the non-reactive mixture of O_2 and Ne in the cylinder…

' x ' g of molecular oxygen $\displaystyle \left(\mathrm{O}_2\right)$ is mixed with $\displaystyle 200$ g of neon $\displaystyle (\mathrm{Ne})$. The total pressure of the non-reactive mixture of $\displaystyle \mathrm{O}_2$ and Ne in the cylinder is $\displaystyle 25$ bar . The partial pressure of Ne is $\displaystyle 20$ bar at the same temperature and volume. The value of 'x' is \_\_\_\_. [Given: Molar mass of $\displaystyle \mathrm{O}_2=32 \mathrm{~g} \mathrm{~mol}^{-1}$. Molar mass of $\displaystyle \mathrm{Ne}=20 \mathrm{~g} \mathrm{~mol}^{-1}$ ]