Basic Chemical Engineering Knowledge, Issue 295, Question 2
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Original question: 2. At the same temperature and pressure, gases of the same volume have the same number of molecules. Reference answer: Yes. Personally, I think: wrong. Reason: Only ideal gases have the same number of molecules at the same volume under the same temperature and pressure ； For real gases at high pressure and low temperature, the number of molecules is significantly different when the volume is the same under the same temperature and pressure.
I also think it’s wrong; the problem doesn’t specify that it’s an ideal gas. Because only ideal gases satisfy PV=nRT.
The answer should be correct; by introducing the compressibility factor Z, we have pv = ZnRT. The value of Z deviating from 1 indicates the degree to which a real gas deviates from an ideal gas under the same temperature and pressure.
Well, I agree with the question raised. An ideal gas should be added, or the same type of gas would work.