While not Heinemann, this site offers worked solutions for similar chemical concepts. You can use a standard Heinemann problem (e.g., calculating E° cell for a Zn/Cu cell) and cross-reference with a generic electrochemistry worked example.
Some students use third-party platforms to view specific chapter solutions, though these may not always be the most up-to-date or authorized versions: Heinemann Chem 2 6E Chapter 4 Solutions | PDF - Scribd heinemann chemistry 2 worked solutions pdf