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4. One mole of air, initially at 150 °C and 8 bar, undergoes the following reversiblè changes. It expands isother- mally to a pressure such that when it is cooled at constant volume to 50 °C its final pressure is 3 bar. Assuming air is an ideal gas for which c, = (7/2)R and cu (5/2)R, calculate Q, W, AU and AH.

4. One mole of air, initially at 150 °C and 8 bar, undergoes the following reversiblè changes. It expands isother- mally to a pressure such that when it is cooled at constant volume to 50 °C its final pressure is 3 bar. Assuming air is an ideal gas for which c, = (7/2)R and cu (5/2)R, calculate Q, W, AU and AH.

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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4. One mole of air, initially at 150 °C and 8 bar, undergoes the following reversiblè changes. It expands isother- mally to a pressure such that when it is cooled at constant volume to 50 °C its final pressure is 3 bar. Assuming air is an ideal gas for which cp = (7/2)R and c, = (5/2)R, calculate Q, W, AU and AH. %3D
Transcribed Image Text:4. One mole of air, initially at 150 °C and 8 bar, undergoes the following reversiblè changes. It expands isother- mally to a pressure such that when it is cooled at constant volume to 50 °C its final pressure is 3 bar. Assuming air is an ideal gas for which cp = (7/2)R and c, = (5/2)R, calculate Q, W, AU and AH. %3D
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