- #1
paulnz
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Hello, I am just wondering if it is possible to actually do the following question based on the information given
An isothermal reversible expansion, for which pV=constant as shown by the curve
joining State A and State B, takes a system from State A to State B along the curved
line on the diagram above. The pressure of State A is 50 x 10^5 Pa and the pressure of
State B is 12.5 x 10^5 Pa. The system is also taken from State A to State B in two
irreversible steps as indicated by the pathways I and II in the diagram. Each irreversible
step involves expansion against a constant external pressure.
If the system is an ideal gas determine the entropy change for the reversible
expansion from State A to State B, and calculate the increase in the number of
microstates for the system during expansion.
pV=constant
I would have thought you would have required the number of moles of the gas to solve the problem, but I could be wrong? That's what is confusing me. Unless the fact that pV= constant has something to do with it?
attached is the graph as the problem requires.
Thanks for any help.
Homework Statement
An isothermal reversible expansion, for which pV=constant as shown by the curve
joining State A and State B, takes a system from State A to State B along the curved
line on the diagram above. The pressure of State A is 50 x 10^5 Pa and the pressure of
State B is 12.5 x 10^5 Pa. The system is also taken from State A to State B in two
irreversible steps as indicated by the pathways I and II in the diagram. Each irreversible
step involves expansion against a constant external pressure.
If the system is an ideal gas determine the entropy change for the reversible
expansion from State A to State B, and calculate the increase in the number of
microstates for the system during expansion.
Homework Equations
pV=constant
The Attempt at a Solution
I would have thought you would have required the number of moles of the gas to solve the problem, but I could be wrong? That's what is confusing me. Unless the fact that pV= constant has something to do with it?
attached is the graph as the problem requires.
Thanks for any help.