12. Calculate the change in entropy during heating (cooling) at constant pressure in the temperature range from T1 to T2 g kg of substance A, if its melting and boiling points, heat capacities in the solid, liquid and gaseous state, heats of fusion and evaporation are known. The average heat capacities of substances in all states of aggregation, the heats of fusion and evaporation can be found in the chemist's reference book, T.1.
Variant number Substance А g, kg T1,K T2,K
12 C4H10-O ethyl ether 50 143 323

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