Question

The following mixture of gases is kept in a cylinder under conditions specified below. Data: Mole fraction 0.275 0.232 0.213 0.280 Pror = 550 torr VTor=8.50 L T = 298 K If the curves below show the distribution of speeds of the four different gases in the mixture, which one of the curves corresponds to argon? Fraction of Molecules Molecular Speed O Curve O Curve B

Answer 1

The Electron Configurations for Noble Gases

	Atomic number	Atomic mass
He	2	4.003
Ne	10	20.18
Ar	18	39.948
Kr	36	83.3

according to Graham Law , molecular speed is depend on molar mass of gas and it's temperature , i.e.

V_avg = [3RT/M]^1/2

so higher molar mass gas has low molecular speed

hence

Curve (B) is represent the Argon gas curve

second option is correct