Practice question
Question
In 2Na₂S₂O₃ + O₂ → 2Na₂SO₄, what is the total number of electrons transferred per mole of Na₂S₂O₃?
Explanation
S (+2 avg. in S₂O₃²−) to +6 in SO₄²−: 4 S lose 4 × (6 - 2) = 16 electrons total. Per Na₂S₂O₃ = 16/2 = 8.
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