For the reaction Hâ‚‚(g) -> 2H(g), what is the entropy change?
Entropy increases as one molecule dissociates into two atoms, increasing disorder. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.