Chemical Engineering Tutorials: Solved Example for First Law of Thermodynamics for a Closed System #1

Wednesday, 27 December 2023

Solved Example for First Law of Thermodynamics for a Closed System #1

Question 1 

A horizontal, perfectly insulated piston-cylinder device contains 1.6mol of helium at 800 kPa. Its volume is 0.005m3 and the ambient pressure is 100 kPa.

a) Calculate the work done when the gas is expanded reversibly until the internal pressure is equal to the ambient pressure. Also sketch the process on a P - V diagram.

b) Calculate the work done when the gas is expanded very suddenly until the internal pressure is equal to the ambient pressure.

Answer:











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