Chapter 4 : Second Law of Thermodynamics

Section 4 : Mathematical Statement of the 2nd Law
 

Example 4.2
A rigid vessel of 0.06 m3 volume contains an ideal gas, CV = (5/2)R, at 500 K and 1 bar. (a) If 15 kJ of heat is transferred to the gas, determine its entropy change. (b) If the vessel is fitted with a stirrer that is rotated by a shaft so that work in the amount of 15 kJ is done on the gas, what is the entropy change of the gas if the process is adiabatic? What is ΔStotal ?


                                        [W=0]
 Hence T2 = 1000K
 
Hence
For second case, the since change of state of the gas is same as in part ‘a’
;
; (Hence stirring process is irreversible) 

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