Lec12_drobny_11

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 trans¡erred between a potential di¡¡erence 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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