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The mass of a molecule of krypton is 2.25 times the mass of a hydrogen. A mixture of equal masses of three gases is enclosed in a vessel, calculate at any temperature the ratio of the root-mean square velocities of krypton and hydrogen gases.

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\(\frac{(v_{rms})_{kr}}{(v_{rms})_{H_2}}=\sqrt\frac{M_{H_2}}{M_{kr}}\)

\(=\sqrt\frac{1}{2.25} \)

\(=\sqrt\frac{4}{9} \)

= 2: 3

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