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The ratio of rms velocities of two gases...

The ratio of rms velocities of two gases at the same temperature is `1: sqrt(2)`. Compare the vapour densities of the gases.

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`(C_1)/(C_2) = sqrt((M_2)/(M_1)) = sqrt((rho_2)/(rho_1)) = 1/(sqrt(2))`
`:. (rho_2)/(rho_1) = 1/2 or rho_(1) : rho_(2) = 2:1`.
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