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Vapour pressure does not depend on the amount of substance. It depends on the temperature alone.

1. Mean free path for a gas λm = 1 / √2πnd²
2. For Hydrogen f = 5, For Helium f = 3, For gas X f = 7. γ = 1 + 2/f = 1 + 2/7 = 9/7
3. So, (7/5, 9/7, 5/3, 7/7)
4. Internal energy of the system is given by U = f/2 nRT

Correct answer: Internal energy of the system is given by U = f/2 nRT

Solution

The internal energy of a system is directly related to the degrees of freedom (f) and is given by U = f/2 nRT. This is a fundamental concept in thermodynamics.

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