The boiling point of hexane is 69.0oC. Estimate (a) its molar enthalpy of vaporization and (b) its vapor pressure at 25oC.

2. At a temperature of 400°C, the specific enthalpy of a water sample is 3100 KJ/kg. What is the phase of the water? a. Solid b. Solid-liquid mixture c. Subcooled liquid d. Saturated liquid e. Saturated mixture f. Saturated vapor g. Superheated vapor For the water in problem 2, determine the following: a. If saturated mixture calculate the quality, x = b. Determine the pressure

13 An ideal solution of 5.25 moles of benzene and 3.0 moles of toluene is placed in a piston and cylinder assembly. At 298 K, the vapor pressure of pure substances are P°(benzene) = 96.4 torr & P°(toluene) = 28.9 torr. The vapor pressure of the solution is; 69.81 torr O 71.83 torr 53.47 torr O 66.61 torr 67.50 torr

For substance A, it is known that the vapor pressure at 300K is 100kPa. It is also known that the boiling point temperature is 340K at 150 kPa. Other given information about substance A: Cpl= 200 J/mol.K and Cpv = 180 J/mol.K c) Using the correlation developed in part a), determine the latent heat of vaporization of substance A in kJ/kmol d) 2 mol of substance A goes through a process where its temperature changes from 400K to 300K at constant pressure 150kPa. i) What phase is present initially? ii) What phase is present at the final state? iii) Determine the total amount of energy transferred (in kJ) through the process and state whether the energy is transferred to or from the substance.