A close vessel contains equal number of nitrogen and oxygen molecules at a pressure of P mm. If nitrogen is removed from the system, then the pressure will be

Number of N2 Molecules = Number of O2 molecules i.e, Number of moles of N2 = Number of moles of O2 molecules Mole fraction of N2 = Mole fraction 2 1 O 2 Partial pressure of N2 = partial pressure of 2 P O mm 2 When N2 is removed then only O2 molecules exerted the pressure total 2 P P Po mm 2