Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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1. Gaseous CO₂ is contained in a vertical piston-cylinder assembly by a piston of mass 50 kg and having a face area of 0.01m³. The mass of the CO2 is 4g. The CO2 initially occupies a volume of 0.005m³ and has a specific internal energy of 657 kJ/kg. The atmosphere exerts a pressure of 100 kPa on the top of the piston. Heat transfer in the amount of 1.95 kJ occurs slowly from the CO2 to the surroundings and the volume of the CO2 decreases to 0.0025m³. Friction between the piston and cylinder walls can be neglected. For the CO2, determine the pressure in kPa and the specific internal energy in kJ/kg. If specific heats of CO₂ at constant volume and at constant pressure are respectively, 0.658 kJ/kg K and 0.849 kJ/kg K, determine the change in entropy.
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Transcribed Image Text:1. Gaseous CO₂ is contained in a vertical piston-cylinder assembly by a piston of mass 50 kg and having a face area of 0.01m³. The mass of the CO2 is 4g. The CO2 initially occupies a volume of 0.005m³ and has a specific internal energy of 657 kJ/kg. The atmosphere exerts a pressure of 100 kPa on the top of the piston. Heat transfer in the amount of 1.95 kJ occurs slowly from the CO2 to the surroundings and the volume of the CO2 decreases to 0.0025m³. Friction between the piston and cylinder walls can be neglected. For the CO2, determine the pressure in kPa and the specific internal energy in kJ/kg. If specific heats of CO₂ at constant volume and at constant pressure are respectively, 0.658 kJ/kg K and 0.849 kJ/kg K, determine the change in entropy.
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Step 1: First Law equation for a closed system
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Step 2: The compression work
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Step 3: Final specific internal energy
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Step 4: Final temperature
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Step 5: Change in entropy
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