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 gases ( K _ argon K _ hydrogen ) is: (Given : Atomic

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Correct answer: B. 1

The formula to calculate the average kinetic energy per molecule of a gas at any temperature $T$ is given by
${K}_{avg} = \dfrac{3}{2}{k}_{B}T$
where, ${k}_{B}$ is Boltzmann constant.
From above equation, it can be concluded that the average kinetic energy per molecule is independent of the molecular weight of the gas.
Hence, the required ratio is $1: 1$ .

A flask contains Hydrogen and Argon in the ratio 2: 1 by mass. The...

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