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9.16 Measurement of Entropy and Enthalpy Changes from EMF Data

From Gibbs-Helmholtz equation we have

gibbs helmholt equation

DG = – nEF and differentiating DG with respect to temperature at constant pressure yields

constant pressure

The quantity temperature-coefficient is the temperature coefficient of the cell. Substituting the value of temperaturecoefficient in equation, we get

entropy assignment

Chemistry Assignment Help Order Now Also DG = DH – TDS

Hence from equations, we obtain

equations

Equation can be used for calculating the entropy changes for the cell reaction in terms of the temperature coefficient of the cell emf. Equation can also be written as

entropy changes

or cell reaction

From equation, the enthalpy change for cell reaction can be determined from the measurement of cell emf and the temperature coefficient of the emf.

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