Arrange the following gases in order of increasing rate of effusion: C₂H₆, Ar, HCl, and PH₃. A) Ar

Question

Arrange the following gases in order of increasing rate of effusion: C₂H₆, Ar, HCl, and PH₃. A) Ar < HCl3 < C₂H₆ B) C₂H₆ < PH₃ < HCl < Ar C) Ar < PH₃ < C₂H₆ < HCl D) C₂H₆ < HCl < PH₃ < Ar E) Ar < PH₃ < HCl < C₂H₆

Quizplus · Accepted Answer

Graham's law of effusion states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass. Therefore, gases with lower molar masses effuse faster. Among the given gases, argon (Ar) has the lowest molar mass, followed by hydrogen chloride (HCl), then phosphine (PH₃), and carbon disulfide (CS₂) has the highest molar mass. Thus, the order of increasing rate of effusion is Ar < HCl < PH₃ < CS₂.

Arrange the Following Gases in Order of Increasing Rate of Effusion