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Four identical 1.0L flasks contain the gases He, Cl2, CH4, and NH3, each at 0 degree...

Four identical 1.0L flasks contain the gases He, Cl2, CH4, and NH3, each at 0 degree celsius and 1 atm pressure. For which gas do the molecules have the smallest average kinetic energy?

A). He

B). Cl2

C). CH4

D). NH3

E). All gases the same

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