The free energy change for a reaction, r G, is the maximum energy that can be

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The free energy change for a reaction, ΔrG°, is the maximum energy that can be extracted from the process as work, whereas ΔrH° is the total chemical potential energy change. The efficiency of a fuel cell is the ratio of these two quantities.Efficiency A,G A,H X 100%

Consider the hydrogen-oxygen fuel cell, where the net reaction is H2(g) + 1/2 O2(g) → H2O(ℓ)
(a) Calculate the efficiency of the fuel cell under standard conditions.
(b) Calculate the efficiency of the fuel cell if the product is water vapor instead of liquid water.
(c) Does the efficiency depend on the state of the reaction product? Why or why not?

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Chemistry And Chemical Reactivity

ISBN: 9780357001172

10th Edition

Authors: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

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