Ap chem help!

<p>I was reading through the Crash Course and on page 66 it says the following:
“CO2 would leak the fastest since it has the largest molar mass.” Does this sound correct? I thought that lighter molecules moved faster. Or is that relating to something else entirely?</p>

<p>O.o I’m pretty sure that’s a typo. Lighter molecules move faster.</p>

<p>lol Crash Course is utter crap.</p>