In 2As + 3H₂S → As₂S₃ + 3H₂, what is the total number of electrons transferred per mole of As?
As (0 to +3 in As₂S₃): 2 As lose 6 electrons total. Per As = 6/2 = 3 electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number