Suppose that a hydrogen fuel cell, as described in the text, is to be operated at 75° C and atmospheric pressure. We wish to estimate the maximum electrical work done by the cell, only the room-temperature data at the back of this book. It is convenient to first establish a zero-point for each of the three substances,H2 , O2, and H2O. Let us take G for both H2 and O2 to be zero at 25°C, so that G for a mole of H20 is -237 kJ at 25°C.(a) Using these conventions, estimate the Gibbs free energy of a mole of H2 at 75°C. Repeat for O2 and H2O.(b) Using the results of part (a), calculate the maximum electrical work done by the cell at 75°C, for one mole of hydrogen fuel. Compare to the ideal performance of the cell at 25°C.

The Gibbs free energy of the compound in terms of change in temperature is given as, ∆G=-S∆T…

Answered: Suppose that a hydrogen fuel cell, as…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Suppose that a hydrogen fuel cell, as described in the text, is to be operated at 75° C and atmospheric pressure. We wish to estimate the maximum electrical work done by the cell, only the room-temperature data at the back of this book. It is convenient to first establish a zero-point for each of the three substances,H₂ , O₂, and H₂O. Let us take G for both H₂ and O₂ to be zero at 25°C, so that G for a mole of H20 is -237 kJ at 25°C.
(a) Using these conventions, estimate the Gibbs free energy of a mole of H₂ at 75°C. Repeat for O₂ and H₂O.
(b) Using the results of part (a), calculate the maximum electrical work done by the cell at 75°C, for one mole of hydrogen fuel. Compare to the ideal performance of the cell at 25°C.

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