When the equation Cu + HNO₃ → Cu(NO₃)₂ + NO + H₂O (dilute acid) is balanced with the smallest whole numbers, what is the coefficient of HNO₃?
Correct answer A. 8
Explanation
Cu loses 2 electrons and N gains 3 (from +5 to +2), so 3Cu react with 2 reduced N. Balanced: 3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O.
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