SRMJEE 2019 Paper with key

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°C. If total pressure exerted by these non-reaching gases is 1 atm, the partial pressure exerted by N2 gas is