52 Questions on 10 Years of Professional Knowledge
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In which of the following processes does the enthalpy remain unchanged? A. Carnot cycle of an ideal gas B. Adiabatic reversible expansion of a gas C. Condensation process of a real gas D. Throttling expansion of a real gas. I think the answers are AD, but some people say B as well. Why is that? I believe the enthalpy change is less than 0, so it should be a isentropic process. Please share your opinions
A, B: There is definitely a change in enthalpy during the throttling expansion of real gases
Why is there a B? In the example calculation for the adiabatic reversible compression of an ideal gas in physical chemistry, the change in enthalpy is positive, whereas it is negative during the expansion process!
Reversible adiabatic expansion process: △U = W0. Does anyone see any problems with this?
Yes, what you say makes sense. The reference answers provided by Kaichuan were A and B; I didn’t think much about it and assumed it should be A and D