Practice question
Question
In 2H₃PO₃ → H₃PO₄ + PH₃, how many electrons are transferred per mole of H₃PO₃?
Explanation
P (+3 in H₃PO₃) to +5 in H₃PO₄ and -3 in PH₃. 1 P loses 2 e⁻, 1 P gains 6 e⁻; total = 4 e⁻ per 2 H₃PO₃, so 2 per mole.
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