First law of thermodynamics: During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the change in internal (thermal) energy of the gas?

Question

Quizplus · Accepted Answer

The first law of thermodynamics states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system. During an isothermal process for an ideal gas, the temperature remains constant, and thus the internal energy also remains constant. Therefore, if 5.0 J of heat is removed, the work done by the gas must be 5.0 J to keep the internal energy unchanged, resulting in a change in internal energy of 0.00 J.

First Law of Thermodynamics: During an Isothermal Process, 5