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Topic: Electrochemistry  (Read 4641 times)

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Offline CoronadoA3

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Electrochemistry
« on: May 04, 2009, 11:37:10 PM »
I recently did an online problem and requested for the answer. I wanted to know if Delta G and Delta G reaction are the same thing. When I used Delta G = -nFE


According to formula for Delta G = -nFE cell. Where n is in mols, F is Faradays (96485) and E cell for problem given in picture is 1.33 V. I assumed that n= 6.
 
When the equation was balanced I got:
 
6e- +14 H+ +Cr2O7^2- --> 2Cr^3+ +7H2O
 
Balancing out anything with:
H20 use O atoms
H+ to balance H atoms and
e- to balance positive charges.
 
I want to know if I used the wrong equation to find Delta G rxn. My answer was  -769950.3 kj and the requested answer was 1060 kJ, why?



« Last Edit: May 04, 2009, 11:55:30 PM by CoronadoA3 »

Offline Rabn

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Re: Electrochemistry
« Reply #1 on: May 06, 2009, 01:56:58 AM »
I have a really quick question for you: If you're trying to solve for  :delta: Go, why aren't you using an equation where :delta: Go is a variable?

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