In 2NaNO₃ → 2NaNO₂ + O₂, what is the total number of electrons transferred per mole of NaNO₃?
N (+5 in NaNO₃) to +3 in NaNO₂: 2 N gain 4 electrons total. Per NaNO₃ = 4/2 = 2.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number