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## Homework Statement

a) Calculate the entropy change when Argon, at 25oC and 0.101 MPa pressure, in

a container of volume 0.5 litre is allowed to expand to 1.0 litre and is simultaneously

heated to 100oC.

b) Calculate the entropy change when the same initial sample is compressed to 0.05

litre and cooled to –25oC.

(Hint: choose a suitable path or combination of successive paths to move between the

two states described )

## Homework Equations

Delta S =nC[tex]_{}V[/tex]ln(T[tex]_{}2[/tex]-T[tex]_{}1[/tex]) + nRln(V[tex]_{}2[/tex]/V[tex]_{}1[/tex])

Where since Argon is monotonic C[tex]_{}V[/tex]=3R/2

## The Attempt at a Solution

But the question does not state the value of n and since this is not an ideal gas I cannot work it out.