Question: The surface of a soap film was increased isothermally by at a temperature T. knowing the surface tension of the soap water solution a and

The surface of a soap film was increased isothermally by Δ at a temperature T. knowing the surface tension of the soap water solution a and the temperature coefficient da/dT, find the increment.
(a) Of the entropy of the films surface layer;
(b) Of the internal energy of the surface layer.

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