{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

IMG_0001_NEW_0030_001

IMG_0001_NEW_0030_001 - the potential...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Lz+ TODAY'S LECTURE: "Electrochemistry" . Electrical Work . Cell Potential and Free Energy Dependence of Cell Potential on Concentration (Nernst Equation) Equilibrium Constants for Redox Reactions . Concentration Cells Free Energy and Gell EfficiencY . For a real cell: 10".,u"t ( Pr"* W*tu.t : -nFEuy (acrual) < W-r* : -nFEut [email protected] . Resistance (frictional heating as electrons flow through wires) + potential work lost as heat o fid Law of thermodynamics: A,S*u"o" > 0 Cel eftLrrcy - w^{ xIWo v* . Ftrn llermodynemics: 1t.., = AG = . Uder standard conditions: | *" | .f Positive cell pot#tfll %lU"*.rs reaction Can determine AG experimentallY (htr n€ed infinitesimally small current flow) 3 LG:-nFEntt Number of electons transferred per mole ofreacfion Electrical Work Galvanic cell reaction = Work is done Because: Electric charges (e-s) are moved The total amount of work done depends on: 1) Work done on each electron
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: : the potential difference: .E""o Porerfrbl diftrerrce 19= work(r) Charge (C) 2) Number of moles electrons moved = n 3) Charge on each electron: -e: -1.602 x l0-le C number of moles of electrons Maximum cell potential (E*u), as calculated theoretically, excluding resistance in wires etc. Maximum workthat can be done Negative becausf.gg$ flows out ofsystem---1-(lt reacfion $ spontaneous e E is positive) Faraday's constant = charge on I mole of electrons=F:exNo ,F :96,485 C/mol 2 \^^/k -) Dependence of Cell Potential on Concentration . For non-standard conditions: LG: AGo + RTIIQ . Since: LG: -nFEuy and AGo : -nFEoun = -nFEut : -nFEoo' * RTIrQ at25"C: 0.0257 L'=L. : Nernst equation hlQ Eun= E*u-#^n . Commonly written in terms of log (base-10) ln(x):2.303 x log(x) at25"C E = E" - o'otnt to*g n Calculate cell potential under non-standard conditions...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern