Question

the internal energy change in an isothermal process is
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Answer 1

Explanation:

In an Isothermal process the temperature is constant. Hence, the internal energy is constant, and the net change in internal energy is ZERO. ... An ideal gas by definition has no interactions between particles, no intermolecular forces, so pressure change at constant temperature does not change internal energy.

Answer 2

Answer:

In Isothermal process the temperature is constant. The internal energy is a state function dependent on temperature. Hence, the internal energy change is zero. For the process you are describing the work is done by the system, but had you not supplied heat, then the temperature would have dropped.