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(A) In an ideal gas,the molecules are assumed to be point masses with no intermolecular forces of attraction or repulsion.Since internal energy is the

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Kinetic energy only

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(A) In an ideal gas,the molecules are assumed to be point masses with no intermolecular forces of attraction or repulsion.Since internal energy is the sum of kinetic and potential energy,and the potential energy due to intermolecular forces is zero for an ideal gas,the internal energy consists solely of the kinetic energy of the gas molecules.Therefore,the internal energy of an ideal gas is a function of temperature only.

In a thermodynamic system where the working substance is an ideal gas,its internal energy is in the form of:

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