At 0^@C, the density of a certain oxide of a gas at 2 bar is the same as that of N_2 at 5 bar. What is the molecular mass of the oxide?

At 0^@C, the density of a certain oxide of a gas at 2 bar is the same

1.	At 0^@C, the density of a certain oxide of a gas at 2 bar is the same as that of N_2 at 5 bar. What is the molecular mass of the oxide?
Answer» Solution :Density d is GIVEN by the relation d = PM/RT If density and temperature are the same for two GASES, we can write `P_1 M_1 = P_2 M_2` MOLECULAR MASS of `N_2 (M_2)` = 28 therefore `2xxM_1` = `5xx28` therefore `M_1` (Molecular mass of the oxide) = `(5xx28)/2` = `70mol^-1`