homework question 6L.1

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Jade Hinds 2B
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Joined: Tue Sep 10, 2019 12:16 am

homework question 6L.1

Postby Jade Hinds 2B » Mon Feb 24, 2020 9:39 pm

calculate the standard reaction gibbs free energy for the following cells:
(a) 2 Ce^4+ (aq) + 3I^- (aq) > 2 Ce^3+ (aq) + I3^- (aq), Ecell = +1.08V
(b) 6 Fe^3+ (aq) + 2 Cr^3+ (aq) + 7 H20 (l) > 6 Fe^2+ (aq) + Cr2o7^2- (aq) + 14 H+ (aq), Ecell = -1.29V

Alexis Webb 2B
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Re: homework question 6L.1

Postby Alexis Webb 2B » Mon Feb 24, 2020 9:57 pm

For this question, you use the equation standard delta G of the reaction= -nFE. All you do is plug in all the variables. E is given, F is a constant, and n is the number of moles of the reaction.

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Re: homework question 6L.1

Postby CMaduno_1L » Sun Mar 01, 2020 9:40 am

Keep in mind, however, that in order to answer the question correctly, you must write out the half-reactions for both part a and part b. This will allow you to determine how many moles of electrons were transferred, n. Otherwise, all the other needed pieces of information are given.

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Re: homework question 6L.1

Postby Rodrigo2J » Sun Mar 01, 2020 11:26 am

First, you have to find the moles of electrons being transferred by writing out the half reactions. Then you need to substitute all your known values into the equation delta G= -nFE.

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