Use extra paper if necessary (not notebook paper). Make sure you develop all equ

Question

Use extra paper if necessary (not notebook paper). Make sure you develop all equations, indicate where data was found, use pencil, clearly, and indicate your answers. Two insulated tanks are connected by a valve. One tank initially contains 1.6 lb of air at 272 degree F, 28 psia, and the other contains 2.7 lb of air at 55 degree F, 25.0 psia. The valve is opened and the two quantities of air are allowed to mix until equilibrium is attained. Employing the ideal gas model with k = 1.28 determine: a. The final temperature, in degree F b. The final pressure, in psia C. The amount of entropy produced, in Btu/degree R

Explanation / Answer

First take assumption as follows :

1) No heat transfer in surrounding as it is perfectly insulated

So it will be (28+25)/2 = 26.5 psia

So it will be (272+55)/2 = 163.5 F

So, amount of entropy produced is 0 as S1 = S2

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