A flask contains argon and chlorine in the ratio of $2 : 1$ by mass. The temperature of the mixture is $27^{0} C$ . The ratio of average kinetic energies of two gases per molecule is

1 : 1

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2 : 1

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3 : 1

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6 : 1

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Solution

The correct option is A $1 : 1$
The average translational kinetic energy (per molecule) of any (ideal) gas (be it monatomic like argon, diatomic like chlorine or polyatomic) is always equal to $\frac{3}{2} k_{B} T$ . It depends only on temperature and is independent of the nature of the gas.
Since argon and chlorine both have the same temperature in the flask, the ratio of average kinetic energy (per molecule) of the two gases is $1 : 1$ .

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A flask contains argon and chlorine in the ratio of 2:1 by mass. The temperature of the mixture is 270C. The ratio of average kinetic energies of two gases per molecule is

A flask contains argon and chlorine in the ratio of $2 : 1$ by mass. The temperature of the mixture is $27^{0} C$ . The ratio of average kinetic energies of two gases per molecule is