Kinetic Theory

In a flask of 'V' litres, 0.2 moles of O₂, 0.4 moles of N₂, 0.1 moles of NH₃ and 0.3 moles of He gases are present at 27^oC. If total pressure exerted by these non-reaching gases is 1 atm, the partial pressure exerted by N₂ gas is