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Topic: Faraday's Law  (Read 949 times)

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Offline dawnfox

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Faraday's Law
« on: August 11, 2018, 09:06:20 PM »
How many moles of electrons are needed to oxidize 115 g Fe to Fe3+?

Offline billnotgatez

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Re: Faraday's Law
« Reply #1 on: August 12, 2018, 12:01:50 AM »
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Offline dawnfox

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Re: Faraday's Law
« Reply #2 on: August 12, 2018, 12:39:34 PM »
im so sorry! i did read the guidelines but i guess i skipped over that exact point. thank you.
so i did attempt it a bit on paper but im stuck with the grams part. i know that fe is oxidized to fe3+. i know the charge on an electron is 1.602 x 10^-19 & i have avogadros number but how im supposed to go about solving this has me confused as well as the 115 grams

Offline Borek

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Re: Faraday's Law
« Reply #3 on: August 12, 2018, 01:47:11 PM »
Charge of an electron doesn't matter. How many electrons required to oxidize one atom of Fe to Fe3+? To oxidize dozen of atoms? How many moles of electrons required to oxidize mole of atoms?
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Offline dawnfox

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Re: Faraday's Law
« Reply #4 on: August 12, 2018, 03:07:13 PM »
3 electrons needed to oxidize one atom of fe to fe3+ right?

Offline Borek

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Re: Faraday's Law
« Reply #5 on: August 12, 2018, 04:03:55 PM »
Yes.

It just occurred to me the question is poorly worded - technically to oxidize the atom electrons are not needed but rather they need to be taken from the atom, but the number is OK.
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