115. Solving a chemistry problem

3. Calculate the change in entropy when 1.6 mol of a CO substance is heated from temperature T2 = 50 K to T2 = 90 K at p = 1.013 105 Pa, if known: Tmelt = 66 K. Tboil = 81 K. molar heat of fusion ΔНmelt = 2 ,44 kJ/mol and molar heat of vaporization ΔNsp = 6.05 kJ/mol. The dependence of heat capacity on temperature for the gaseous state Ср = a ВТ с´/Т2 is taken from the reference book. Cp, tv \u003d 18.73 J / mol * K, Cf = 29.4 J / mol * K.