# Chapter 10 Gases and Their Properties - Study Questions - Page 403f: 80

#### Work Step by Step

a) $d=PM/RT$, with the same T and P, $d\propto M$, so $Cl_2$ is the most dense out of all of them. b) Effusion rate is inversely proportional to the square root of the molecular weight, so He will effuse the fastest.

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