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Topic: Question on number of electrons transferred in a reaction  (Read 5857 times)

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Offline RiddlingLynx

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Question on number of electrons transferred in a reaction
« on: June 10, 2009, 05:28:27 PM »
The given reaction is:
3 Cu + 2 NO3- + 8 H+ :rarrow: 3 Cu2+ + 4 H2O + 2 NO.

So 2 e- proceed to Cu, and 4 e- leave NO3-. I've gotten the equation to:

12 Cu+ + 4 NO3- + 16 H+ :rarrow: 12 Cu2+ + 8 H2O + 4 NO

... by accounting for oxidation states and cross multiplying. What I want to know is: how many electrons in total have been transferred by this reaction? I believe it's two, but please correct me if I'm wrong. I'm getting confused as to whether I need to account for the coefficients in counting electrons transferred.

Thanks in advance!
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Offline Astrokel

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Re: Question on number of electrons transferred in a reaction
« Reply #1 on: June 11, 2009, 12:25:44 AM »
What are the two half reactions?
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