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Help S. You received no credit for this question in the previous attempt. View of 3 Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part A piston-cylinder device initially contains 15 13 of helium gas at 25 psia and 70°F. Helium is now compressed in a polytropic process (PV- constant) to 70 psia and 300' Use data from tables. Determine whether this process is reversible, irreversible, or impossible. This process is: Impossible (Click to selecry Irreversible Reversible Impossible < Prev 11 of 11 !!! Next e to search o a

Answer 1

Since the Entropy change is coming greater than 0, then as per Clausius inequality process is impossible
As we know that for a polytropic process 1:54 In (12) In 1 In (Tue) 70 In 1929.67870 759.67 825 from 25 x R = 2.6089 psia fts UmR X(15) Left Entrefy charge of the surroundings (p= 1.25 Btu/lbina = 0.753 stulldon Dsus Tour Q = Dutw =MCUAT+ f2u2-24 CUAT+ P22-10 = 258 15 x0.753x (759.67-5 29.67)+(70x769-25X13 2.6089 x 529.67 1-1.54 - 10.34 Btu since heat is released from the system .:8= 10.34 Bry Putting this value in 0.0195 Btulk Surt 10134 529.67

Entropy Change Asa Adding syio and As= 0.0158+ o.01952 Since DS= 0.00372-③ from ²0. Entropy charge is so therefore as per Clausins inequality process is impossible. (Ans)

Griven Initid Volume (V.) = 15 ft² (P.) = 25 psia Initial Pressure of Helium gas Initial temperature of Helium After compression, pressure (P₂) is = 70 psia jas (T) = 70°f=7+459.67 :529.67 R Ris Rankie Temperature (T2) is = 300 f = 300+ 459.67 959.67R To Find - Whether this or impossible - is reversible, irreversible process solution - According ds=do 1 d sa to clausius inequality. if process is impossible (violete and low of therme.) process is reversible ds- desco process is ineversible, but possible entropy [system + suverond The Entropy change of the system Draum mephen (I ja merin (1) m=piv, ds is change be written as, from ideal RT, As meline & Pive [pl. (I 1 - 2 (6)] = 25015 IBTU 754.07 529.67 2) 170 Is 2.6809X529.67 -0.0158 BTU Hel
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