Chemistry Assignment Help with Measurement of Entropy

9.16 Measurement of Entropy and Enthalpy Changes from EMF Data

From Gibbs-Helmholtz equation we have



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



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



Also DG = DH – TDS

Hence from equations, we obtain



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



or

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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