a)The volume of a sample of helium is increased by withdrawing the piston of the

Question

a)The volume of a sample of helium is increased by withdrawing the piston of the cotaining cylinder, The final pressure Pf is found to be equal to the initial pressure Pi times(Vi/Vf)^1.2, Vi and Vf being the initial and final volumes. Assuming that the product PV is always equal to 2U/3, Will
1) the energy and 2) te entropy of the gas increase, remain constant, or decrease during the process.
b) if the process were reversible, how much work would be done and how much heat would be added in doublling the volume of the gas? Take Pi=1 atm and Vi=1m^3

Explanation / Answer

last answer is 1 J. here's the link: http://s12.postimage.org/snt1zmfm5/Photo0570.jpg

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