Explanation
Internal energy of an ideal gas does not depend upon volume of the gas, because there are no forces of attraction/repulsion amongst the molecules of an ideal gas.
Also, internal energy of ideal gas depends on temperature.
In isothermal changes, temperature remains constant
The S.I. unit of R is J/mol-K.
According to Boyle’s law PV = constant.
From Andrew's curve
The collision of molecules of ideal gas is elastic collision.
In free expansion of van der waal’s gas, its temperature decreases
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