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handout_L10_CellPotentialFreeEnergy

handout_L10_CellPotentialFreeEnergy - Lecture 10 Ecell and...

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Lecture 10: cell and G • Reading: Zuhdahl: 11.3 • Outline – E° cell and work – E° cell and G cell and work We saw in Lecture 9 how to construct a galvanic electrochemical cell that was capable of generating a flow of electrons. This flow of electrons (current) can be used to perform work on the surroundings. cell and work (cont.) From the definition of electromotive force (emf): In English: 1 J of work is done when 1 C of charge is transferred between a potential difference of 1 V. Volt = work (J)/charge (C) cell and work (cont.) Recall, we have a system-based perspective such that work done by the system is negative : 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? cell and work (cont.) qE° cell = - w (1.5 mol e - )(2 V) = - w What do we do with this?
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