Lec12_drobny_11 - Lecture 12: E cell and ! G Reading:...

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Unformatted text preview: Lecture 12: E cell and ! G Reading: Zumdahl: 11.3 Recommended Problems:11.31, 11.33, 11.35, 11.37, 11.39 Outline E cell and work E cell and ! G E cell and work A galvanic electrochemical cell generates a fow oF electrons From the anode (where oxidation occurs) to the cathode (where reduction occurs). This fow oF electrons (current) can be used to perForm work on the surroundings. E cell and work (cont.) From the defnition o electromotive orce (em): In English: 1 J o work is done when 1 C o charge is transerred between a potential dierence o 1 V. Note: electron charge=1.60x10-19 C Volt = work (J)/charge (C) E cell and work (cont.) Recall, we have a system-based perspective such that work done by the system is negative : E cell = - w/q w = work q = charge (not heat) Rearranging: qE cell = - w An example: What is the amount of work that is done by a galvanic cell in which 1.5 moles of electrons are passed between a potential of 2 V? E cell and work (cont.) qE cell = - w (1.5 mol e- )(2 V) = - w What do we do with this? E cell and work (cont.) The Faraday (F)=the charge of one mole of electrons: F=eN A =(1.60x10-19 C)(6.02x10 23 mol-1 ) 1 F = 96,485 C/mol...
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Lec12_drobny_11 - Lecture 12: E cell and ! G Reading:...

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