N2 is found in a litre flask under 100kPa pressure and O2 is found in another 3 litre flask under 320 kPa pressure. If the two flasks are connected, the resultant pressures is
265 kPa
The key idea is that total number of moles are the same initially and finally. Also, the temperature remains constant.
Hence, PV = constant.
Total volume = 4 litres.
Total pressure = RTV=(100+960)4=265 kPa