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A flask contains argon and oxygen in the ratio of 3: 2 in mass and the mixture is kept at 27°C. The ratio of their average kinetic energy per molecule respectively will be

1. 3: 2
2. 9: 4
3. 2: 3
4. 1: 1

Correct answer: 1: 1

Solution

The average kinetic energy per molecule of a gas is directly proportional to its temperature and is independent of the type of gas. Since both argon and oxygen are at the same temperature, their average kinetic energies per molecule are equal, resulting in a ratio of 1:1.

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