12. Substance A evaporates at temperature T. Calculate the specific heat of evaporation at the same temperature. Write an equation for the dependence of the heat of vaporization of substance A on temperature. Take the heat capacities of saturated vapor and liquid from the reference book, assuming that they are constant in a given temperature range. Heat, evaporation at normal boiling point are given in the table.
Option Substance A Ts.t.n., K
12 HNO3 357 28.2 300 400

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