Problem 4.6:
One mol of methanol vapor is cooled under constant pressure in a closed system by removing 25000 J of heat. Initially, the system is at 2 bar, 200 °C.
a) Determine the final temperature.
b) Calculate the entropy change of methanol.
Additional data: boiling point of methanol at 2 bar: 83 °C; heat capacity of vapor: 60 J/mol K; heat capacity of liquid: 80 J/mol K; heat of vaporization at 2 bar: 36740 J/mol.
Problem 4.7:
Calculate the entropy of toluene in the following states:
a) 10 bar, 300 °C
b) Vapor-liquid mixture at 10 bar with quality 25%.
c) 10 bar, 20 °C.
d) 15 bar, 20 °C.
The following data are available:
