38.
In a flask of volume āVā litres, 0.2 moles of O 2 , 0.4 moles of N 2 , 0.1 moles of NH 3and 0.3 moles of He gases are present at 27°C. If the total pressure exerted by these non-reacting gases is 1 atm, the partial pressure exerted by N 2gas is