(3) Calculate the entropy change when a sample of argon at 25 °C and 1.00 atm in a container
of volume 500 cm3 is compressed to 50 cm3 and cooled to -25 °C.
For argon, Cpm = 20.786) K-Imol-1. Assume that argon behaves perfectly.

Explanation:

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In this case, since the entropy change when an ideal gas undergo both a volume and temperature change is computed by:

Whereas the molar Cp is 20.786 J/(mol*K) and the final pressure is computed via the Boyle's law:

Thus, we plug in the data (temperatures in Kelvin) to obtain:

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