Question

We ordinarily say that ΔEint=0 for an isothermal process. Does this assume no phase change takes place? Explain your answer.

a) Yes, because phase changes require energy input or release.
b) No, phase changes do not affect internal energy.
c) Partially, as phase changes may or may not impact internal energy.
d) Not applicable.

Answer 1

The assumption that ΔEint=0 for an isothermal process implies that no phase change takes place. Therefore the answer is a) Yes, because phase changes require energy input or release.

Step-by-step explanation:

The statement that ΔEint=0 for an isothermal process assumes no phase change takes place. The assumption that ΔEint=0 for an isothermal process implies that no phase change takes place. a) Yes, because phase changes require energy input or release.

When a substance undergoes a phase change, such as from a solid to a liquid or a liquid to a gas, energy is either absorbed or released. This energy change would result in a change in the internal energy of the system. Therefore, for an isothermal process, where the temperature remains constant, it assumes no phase change takes place.