We did problems 2.7 and 2.8 in class cuz all those solution books directly jump to using PV is a constant without explaining how the process works. Without knowing the process, PV= constant seems wrong cuz n is changing. So our prof decided to solve it in class.
Yeah ikr. Sometimes we personally send him questions and if he feels like its a thought provoking one he doesn't reply the solution. He shares it with the whole class during his next period.
I think even this question was raised as a doubt by someone in class.