In a flask of volume ‘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°C. If the total pressure exerted by these non-reacting gases is 1 atm, the partial pressure exerted by N2 gas is:
1
0.3 atm
2
0.1 atm
3
0.2 atm
4
0.4 atm