piston–cylinder assembly contains air, initially at 2.6 bar, 134 K, and a volume of 2.6 m3. The air undergoes a process to a state where the pressure is 0.8 bar, during which the pressure–volume relationship is pV = constant. Assuming ideal gas behavior for the air, determine the work for the process in kJ.

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Asked Oct 27, 2019
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piston–cylinder assembly contains air, initially at 2.6 bar, 134 K, and a volume of 2.6 m3. The air undergoes a process to a state where the pressure is 0.8 bar, during which the pressure–volume relationship is pV constant. Assuming ideal gas behavior for the air, determine the work for the process in kJ.

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Initial pressure 2.6bar Initial temperature=134k Initial volume 2.6m3 Final pressure-0.8 bar pv-constant

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we knowthat n =1 for isothermal process V2 and w pvIn or V/2 w mRT In inisothermal process PV=V2 Р. 2.6 x 2.6 v2 0.8 8.45 v2

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w mRT In Р.у — тRI R 287kj kg.k m RT 260x 2.6 т 3 0.287x 134 m 17.577kg V2 w mRT,In 8.45 w 17.577x 0.287 x 134 In 2.6 w=796.74kj

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