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