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# Average Molecular Velocity of Gases: Root Mean Square Speed

CHEM-ST6W7F

Which of the following gas molecules will have the fastest root mean square speed if all samples of these gases are at STP?

A

$N_{2}$

B

$O_{2}$

C

$F_{2}$

D

All these gases will have the same root mean square speed when they are all at STP.