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A flask contains Hydrogen and Argon in t...

A flask contains Hydrogen and Argon in the ratio 2:1 by mass. The temperature of the mixture is `30^@` C. The ratio of average kinetic energy per molecule of the two games (K argon/K hydrogen) is:
(Given: Atomic Weight of Ar=39.9)

A

39.9

B

39.9/2

C

2

D

1

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