Gradebook 4/25/2018 11:30 PM 3.2/15 Print Calculator Periodic Table Question 10
ID: 1046930 • Letter: G
Question
Gradebook 4/25/2018 11:30 PM 3.2/15 Print Calculator Periodic Table Question 10 of 19 Map e4 Sapling Learning For the following reactions, determine E, AG, and K, given the balanced half reactions and the standard reduction potentials. Also, determine if the reaction is spontaneous as written. 2+ C03 + + e- Co E 1.92 V E:-0.575 V Number Number Number O Spontaneous J??O Not Spontaneous Fe3 + + e- ? Fe2+ E.=0.771 V 2e-- 11,0) E' = 1.229 V continued below.. O Previous ? Give Up & View Solution check Answer Next -I Exit
Explanation / Answer
A) E0cell = E0cathode - E0anode
= 1.92-0.575
= 1.345 v
DG0 = - nFE0cell
n = no of electrons transfered = 2
F = 96500 C
E0cell = 1.345 v
DG0 = - 2*96500*1.345
= -259.56 kj/mol
it is spontaneous
DG0 = -RTlnK
T = 298 K
R = 8.314 j.k-1.mol-1
-259.56*10^3 = -8.314*298lnk
k = 3.15*10^45
B)
E0cell = E0cathode - E0anode
= 0.771 - 1.229
= -0.458 v
DG0 = - nFE0cell
n = no of electrons transfered = 4
F = 96500 C
E0cell = -0.458 v
DG0 = - 4*96500*-0.458
= 176.788 kj/mol
it is non-spontaneous
DG0 = -RTlnK
T = 298 K
R = 8.314 j.k-1.mol-1
176.788*10^3 = -8.314*298lnk
k = 1.025*10^-31
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.