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The following equation gives the internal energy of a certain substance U = 3.64 PV + 90 where, U is kl/kg, P is in kPa and V is in m². A system composed of 3.5 kg of this substance expands from an initial pressure of 500 kPa and a volume of 0.25 m³ to a final pressure 100 kPa in a process in which pressure and volume are related by PV¹25 = constant. If the expansion is quasi-static, find Q, AU and W for the process. In another process, the same system expands according to the same pressure- volume relationship as in part (i), and from the same initial state to the same final state as in part (1), but the heat transfer in this case is 32 kJ/kg. Find the work transfer for this process. Explain the difference in work transfer in parts (i) and (ii). i. ii.

The following equation gives the internal energy of a certain substance U = 3.64 PV + 90 where, U is kl/kg, P is in kPa and V is in m². A system composed of 3.5 kg of this substance expands from an initial pressure of 500 kPa and a volume of 0.25 m³ to a final pressure 100 kPa in a process in which pressure and volume are related by PV¹25 = constant. If the expansion is quasi-static, find Q, AU and W for the process. In another process, the same system expands according to the same pressure- volume relationship as in part (i), and from the same initial state to the same final state as in part (1), but the heat transfer in this case is 32 kJ/kg. Find the work transfer for this process. Explain the difference in work transfer in parts (i) and (ii). i. ii.

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:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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The following equation gives the internal energy of a certain substance U = 3.64 PV + 90 where, U is kl/kg, P is in kPa and V is in m². A system composed of 3.5 kg of this substance expands from an initial pressure of 500 kPa and a volume of 0.25 m² to a final pressure 100 kPa in a process in which pressure and volume are related by PV¹25= constant. i. If the expansion is quasi-static, find Q, AU and W for the process. In another process, the same system expands according to the same pressure- volume relationship as in part (i), and from the same initial state to the same final state as in part (i), but the heat transfer in this case is 32 kJ/kg. Find the work transfer for this process. Explain the difference in work transfer in parts (i) and (ii).
Transcribed Image Text:The following equation gives the internal energy of a certain substance U = 3.64 PV + 90 where, U is kl/kg, P is in kPa and V is in m². A system composed of 3.5 kg of this substance expands from an initial pressure of 500 kPa and a volume of 0.25 m² to a final pressure 100 kPa in a process in which pressure and volume are related by PV¹25= constant. i. If the expansion is quasi-static, find Q, AU and W for the process. In another process, the same system expands according to the same pressure- volume relationship as in part (i), and from the same initial state to the same final state as in part (i), but the heat transfer in this case is 32 kJ/kg. Find the work transfer for this process. Explain the difference in work transfer in parts (i) and (ii).
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