It sounds like you're looking for an about the solutions to the popular textbook Physical Chemistry by Peter Atkins , Julio de Paula , and James Keeler (often referred to in shorthand as "Castellan" – though note: a classic older physical chemistry text by Gilbert W. Castellan exists; many students confuse the two, or use "Castellan" to mean the standard PChem problem sets).
Solutions Guide to Accompany Physical Chemistry by Gilbert W. Castellan castellan physical chemistry solutions
: Help for students who may feel underprepared for the high-level math often found in P-Chem courses. Core Topics Covered article or in-depth discussion It sounds like you're
The problems in Castellan are not plug-and-chug. They are conceptual puzzles. For example, a typical problem might ask you to derive the relationship between the Joule-Thomson coefficient and the van der Waals parameters, or to calculate the entropy change of the universe for an irreversible adiabatic expansion. This is why require more than a numeric answer; they require a narrative. For example, a typical problem might ask you
Identify the standard state (usually the pure liquid at 1 atm).
Clear, logical derivations of the laws of thermodynamics.