homework question 6L.1

[Jade Hinds 2B]

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]

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.

[CMaduno_1L]

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.

[Rodrigo2J]

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.