Vapor pressure data for an organic compound are: T °C psat kPa -50. 9.46 +10. 148.42 a. Estimate the vapor pressure in kPa at -20° C? You can't be too precise here, but you can beat the accuracy of 9.46+148.42 kPa = 78.94 kPa. b. What is the heat of vaporization in J/mol at -20° C? You may assume the vapor phase is an ideal gas and that the vapor molar volume is much greater than the liquid molar volume.

A 6.25L fire extinguisher contains 4 mol CO₂. What is the pressure (Pascal) of CO₂ inside the fire extinguisher if the gas temperature is 25 °C? (Use the van der Waals equation)

3- The water in the form of superheated steam with a mass of 1 kg at a pressure of 500 kPa and a temperature of 500 ° C in the piston-cylinder assembly is first cooled to a temperature of 120 °C in a fixed volume and then the water is cooled and condensed at a constant temperature until it becomes a saturated liquid. a) Draw the T-v diagram of the states. b) Find the work done during the state changes. c) Find the heat transfer from the piston and cylinder assembly to the environment. Note: Changes in kinetic and potential energies are negligible

2) A piston-cylinder device initially contains 0.85 m of ethylene at 118 kPa and 295°C. The air inside the cylinder is expanded isothermally to 1.33 m'. Determine the work done (in kJ) during this process. i) Prove that ethylene is behaving as an ideal gas. ii) Determine the work done (in kJ) during this process. Activate Window tn Sottinas to activ