Part A: 10 moles of ideal gas initially at 10 atm and 250 K is expanded isothermally and reversibly to afinal pressure of 2 atm. Calculate W, AU, and Q in Joules.Part B: The same gas in problem A, starting in the same initial state, is expanded isothermally against aconstant external pressure of 2 atm, to a final pressure of 2 atm. Calculate W, AU, and Q in Joules forthis irreversible process.Part C: The same gas in part B, starting in the same initial state, is expanded isothermally to a finalpressure of 2 atm. The process is carried out in 4 stages. First the gas is expanded against a constantpressure of 8 atm, to 8 atm. Then the gas is expanded against a constant pressure of 6 atm, to 6 atm.Then the gas is expanded against a constant pressure of 4 atm, to 4 atm. Finally, the gas is expandedagainst a constant pressure of 2 atm, to 2 atm. Calculate w, AU, and Q in Joules for the 4-step process.How do your answers compare to those you obtained for problems 5 and 6 above?

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Part A: 10 moles of ideal gas initially at 10 atm and 250 K is expanded isothermally and reversibly to a final pressure of 2 atm. Calculate W, AU, and Q in Joules.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter3: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 54P: Two moles of a monatomic ideal gas at (5 MPa, 5 L) is expanded isothermally until the volume is...

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Question

Part A: 10 moles of ideal gas initially at 10 atm and 250 K is expanded isothermally and reversibly to a
final pressure of 2 atm. Calculate W, AU, and Q in Joules.
Part B: The same gas in problem A, starting in the same initial state, is expanded isothermally against a
constant external pressure of 2 atm, to a final pressure of 2 atm. Calculate W, AU, and Q in Joules for
this irreversible process.
Part C: The same gas in part B, starting in the same initial state, is expanded isothermally to a final
pressure of 2 atm. The process is carried out in 4 stages. First the gas is expanded against a constant
pressure of 8 atm, to 8 atm. Then the gas is expanded against a constant pressure of 6 atm, to 6 atm.
Then the gas is expanded against a constant pressure of 4 atm, to 4 atm. Finally, the gas is expanded
against a constant pressure of 2 atm, to 2 atm. Calculate w, AU, and Q in Joules for the 4-step process.
How do your answers compare to those you obtained for problems 5 and 6 above?

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