Which of the following statements is(are) correct when an ideal gas goes from an initial to a final state in a single process?
A) No work is done on or by the gas when the volume remains constant.
B) No energy is transferred into or out of the gas as heat transfer when the temperature remains constant.
C) The internal energy of the gas does not change when the pressure remains constant.
D) All the statements above are correct.
E) Only statements (a) and (b) above are correct.

Question

Quizplus · Accepted Answer

Statement A is correct because when the volume of an ideal gas remains constant during a process, there is no change in volume, and thus no work is done (since work done by or on an ideal gas is given by $W = P\Delta V$, where $P$ is pressure and $\Delta V$ is the change in volume). Statement B is incorrect because even if the temperature remains constant (isothermal process), energy can still be transferred as heat if the gas expands or is compressed. Statement C is incorrect because the internal energy of an ideal gas depends only on its temperature, so if the pressure remains constant but the volume changes in such a way that the temperature changes, the internal energy changes as well.

Which of the Following Statements Is(are) Correct When an Ideal