Winter 2013 final Q4

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Jasmine Botello 2F
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Winter 2013 final Q4

Postby Jasmine Botello 2F » Mon Mar 12, 2018 10:26 am

For this question, I know how to calculate everything except n. Could someone please explain how they got n because it does not explain that part? Is it the half reactions? because those are not given either...

Chem_Mod
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Re: Winter 2013 final Q4

Postby Chem_Mod » Mon Mar 12, 2018 2:21 pm

Sorry without the question unable to give an answer.

Jasmine Botello 2F
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Re: Winter 2013 final Q4

Postby Jasmine Botello 2F » Tue Mar 13, 2018 11:07 am

Here is the question
Attachments
IMG_0066.jpg

David Minasyan 1C
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Re: Winter 2013 final Q4

Postby David Minasyan 1C » Tue Mar 13, 2018 1:32 pm

n is the movement of electrons so if you do the oxidation and reduction half reactions you should find that n = 4. Also I think you can just look at the charge of iron going from 0 in the reactants to +4 in the products and determine that the iron is being oxidized and 4 electrons are leaving, but if someone would confirm that would be great.

Peter Dis1G
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Re: Winter 2013 final Q4

Postby Peter Dis1G » Wed Mar 14, 2018 4:51 pm

Since it is basic reaction, you have to get two half equations to find out the electrons, which is n.

Rachel Wang
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Re: Winter 2013 final Q4

Postby Rachel Wang » Fri Mar 16, 2018 6:45 pm

Kinda stumped too but I thinkkkkk it's because Fe has an oxidation state of Fe0 -> Fe+2 + 2e-. And because there are 2 of Fe and 2 Fe(OH)2, 2x2e- = 4e- = n?

Justin Bui 2L
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Re: Winter 2013 final Q4

Postby Justin Bui 2L » Sat Mar 17, 2018 7:20 pm

Yeah, n=4 and that refers to electrons moved because this type of n is a pure number and not moles.

Gwen Peng 1L
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Re: Winter 2013 final Q4

Postby Gwen Peng 1L » Sat Mar 17, 2018 10:59 pm

n refers to the number of electrons moved, or electrons on the product side, therefore since 4 electrons were transferred n=4

Akash_Kapoor_1L
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Re: Winter 2013 final Q4

Postby Akash_Kapoor_1L » Sun Mar 18, 2018 2:41 pm

How do you find these old finals?

Phillip Tran
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Re: Winter 2013 final Q4

Postby Phillip Tran » Sun Mar 18, 2018 5:04 pm

course readers^


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