A neon-dioxygen mixture contains $$64 \mathrm{~g} \mathrm{~O}_2$$ and $$160 \mathrm{~g} \mathrm{~Ne}$$. If the total pressure is $$25 \mathrm{~bar}$$, calculate the partial pressure of dioxygen.

Find the temperature in degree Celsius if volume and pressure of 2 mole ideal gas is $$20 \mathrm{~dm}^3$$ and $$4.926 \mathrm{~atmospheres}$$ respectively. ($$\mathrm{R}=0.0821 \mathrm{~dm}^3 \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1})$$

A closed container contains mixture of non-reacting gases $$A$$ and $$B$$. Partial pressure of $$A$$ and $$B$$ are 4.5 bar and 5.5 bar respectively. Find mole fractions of $$A$$ and $$B$$ respectively?

The volume of a gas is $$4 \mathrm{~dm}^3$$ at $$0^{\circ} \mathrm{C}$$. Calculate new volume at constant pressure when the temperature is increased by $$10^{\circ} \mathrm{C}$$.