Two moles of Helium gas 
are initially at temperature 
and occupy a volume of 20 litres. The gas is first expanded at constant pressure until the volume is doubled. Then it undergoes an adiabatic change until the temperature returns to its initial value. What are the final volume?
Text Solution
Verified by ExpertsA
From ideal gas equation
initial pressure 
When volume of the gas isdoubled at constant pressure, its temperature is also doubled. This process is shown on 
curve by line AB. The gas then cools to temperature T adiabatically. This is shown by curve BC. The whole process is represented by the curve 
.
At point B , pressure
.
Volume 
,
Temperature 
.
For adiabatic process 
constant
Final volume 
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