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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: dawnfox on August 11, 2018, 09:06:20 PM

Title: Faraday's Law
Post by: dawnfox on August 11, 2018, 09:06:20 PM
How many moles of electrons are needed to oxidize 115 g Fe to Fe3+?
Title: Re: Faraday's Law
Post by: billnotgatez on August 12, 2018, 12:01:50 AM
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Title: Re: Faraday's Law
Post by: dawnfox 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
Title: Re: Faraday's Law
Post by: Borek 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?
Title: Re: Faraday's Law
Post by: dawnfox on August 12, 2018, 03:07:13 PM
3 electrons needed to oxidize one atom of fe to fe3+ right?
Title: Re: Faraday's Law
Post by: Borek 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.