At 0°C, the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?

Density, d=MpRTWhen,T and d are same and R is constant, then p1M1 (gaseous oxide) =p2M2 (nitrogen). 2 bar ×M1=5 bar ×28μ molar mass of N2=28μMolecular mass of unknown oxide,M1=5bar×28μ2bar=70μ