Answer to Question #111213 in Mechanical Engineering for zainab

Question #111213
0.078 kg of a carbon monoxide initially exists at 130 kPa and 120oC. The gas is then expanded polytropically to a state of 100 kPa and 100oC. Sketch the P-V diagram for this process. Also determine the value of n (index) and the boundary work done during this process.
1
Expert's answer
2020-04-24T13:38:44-0400

Mass of carbon monoxide= 0.078 kg, Initial pressure P1= 130 kPa, T1=1200C=120+273=393 K and following polytropic process and P2=100 kPa and T2=1000C+273=373 K




On taking log both sides


log(0.949)=


-0.0227= (-0.114)


0.0227n=0.114n-0.114


0.0913 n= 0.114


n= 1.248

Now, here using relation for polytropic process we can find value of V1 and V2 as value of mass of as is given so we get the following graph














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