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lifeonfire
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Homework Statement
A gas fills a closed chamber connected to an evacuated piston chamber via a valve. The apparatus is diathermal (heat can flow through the walls of the chamber). The valve is opened to vent the gas into the piston. The piston then slowly compresses the gas back into the original chamber. Explain what is happening to the entropy during the cycle.
Homework Equations
S = Q/T; PV = nRT; ΔU = ΔQ - ΔW
The Attempt at a Solution
Step 1: Gas comes out from the chamber into the piston chamber. It expands in volume. So the entropy increases? And the temperature of the gas will drop?
Step 2: When gas is compressed, volume decreases and so entropy decreases and temperature will increase??
Help! i don't think I am doing it correctly...