## Winter 2013 final Q4

Jasmine Botello 2F
Posts: 67
Joined: Fri Sep 29, 2017 7:04 am

### Winter 2013 final Q4

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
Posts: 18015
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 418 times

### Re: Winter 2013 final Q4

Sorry without the question unable to give an answer.

Jasmine Botello 2F
Posts: 67
Joined: Fri Sep 29, 2017 7:04 am

### Re: Winter 2013 final Q4

Here is the question
Attachments

David Minasyan 1C
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

### Re: Winter 2013 final Q4

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
Posts: 97
Joined: Fri Sep 29, 2017 7:04 am

### Re: Winter 2013 final Q4

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

Rachel Wang
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

### Re: Winter 2013 final Q4

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
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

### Re: Winter 2013 final Q4

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

Gwen Peng 1L
Posts: 36
Joined: Sat Jul 22, 2017 3:01 am

### Re: Winter 2013 final Q4

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
Posts: 52
Joined: Thu Jul 13, 2017 3:00 am
Been upvoted: 1 time

### Re: Winter 2013 final Q4

How do you find these old finals?

Phillip Tran
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am