Question

You are given the reaction Cu + HNO3 → Cu(NO3)2 + NO + H2O.

Half-reactions:

First: 3 upper C u right arrow 3 upper C u superscript 2 plus, plus 6 e superscript minus. Second: 2 upper N superscript 5 plus, plus 6 e superscript minus right arrow 2 upper N superscript 2 plus.
Complete the final balanced equation based on the half-reactions.

Cu +
HNO3 Right arrow.
Cu(NO3)2 +
NO +
H2O

Answer 1

Balanced equation:

3 Cu + 8 HNO3 → 3 Cu(NO3)2 + 2 NO + 4 H2O

(From the half-reactions: 3 Cu → 3 Cu2+ + 6 e− and 2 NO3− + 8 H+ + 6 e− → 2 NO + 4 H2O; combine and convert ions back to HNO3/Cu(NO3)2.)