One kg mole of an ideal gas is compressed isothermally at 127 degrees C from 1 a

Question

One kg mole of an ideal gas is compressed isothermally at 127 degrees C from 1 atm to 10 atm in a piston and cylinder arrangement. Calculate the entropy change of the gas, the entropy change of the surroundings and the entropy change of the "universe" resulting from the process if:

a) The process is mechanically reversible and the surroundings consist of a heat reservoir at 127 degrees C.

b) The process is mechanically reversible and the surroundings consist of a heat reservoir at 27 degrees C.

c) The process is mechanically irreversible, requiring 20% more work than the mechanically reversible compression and the sorroundings consist of a heat reservoir at 27 degrees C?

Explanation / Answer

a) entropy change = q/T

Q = 100 KJ

T = 127 c =400 K

del s = 100/400 = 0.25 KJ/K

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