Calculate the standard entropy of vaporization of water at 85°C, given that its standard entropy of vaporization at 100.°C is 109.0 J · K^–1· mol^–1 and the molar heat capacities at constant pressure of liquid water and water vapor are 75.3 J · K^–1 · mol^–1 and 33.6 J · K^–1 · mol^–1, respectively, in this range.