Just a Scientist having some fun
A scientist was playing with a 2 mole sample of Helium gas at 298.15 K, the pressure in the sample container was recorded to be 1 Bar. The scientist cooled the sample to boiling temperature 4 K, when it condensed into liquid phase, he cooled it further to 2 K, it underwent another phase transformation into a second liquid form, called liquid helium II. The scientist then used a high intensity laser to instantaneously vaporize the sample back to 298.15 K and to pressure .5 Bar.
What is the entropy change for this whole process?
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