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Average Velocity of Gases

Average Velocity of Gases

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A chemist has flask containing a mixture of two gases at STP. The average velocity of a Gas 1 molecule is twice that of a Gas 2 molecule. Among the following, Gases 1 and 2 are most likely:

He = 4 g/mol
Ne = 20 g/mol
Ar = 40 g/mol
Kr = 80 g/mol

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