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Cu (+2 in CuO) to 0 in Cu: change = 0 - (+2) = -2, meaning 2 electrons gained per Cu atom.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
Reaction: CuO + CO → Cu + CO₂. Moles of Cu = 6.4/64 = 0.1 mol. 1 mol Cu from 1 mol CuO; mass = 0.1 × 79.5 = 7.95 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
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