Question

CAN YALL PLEASE HELP ME I HAVE 4 HOURS TO DO THESE!! THANK YOU!!

Question 1

A mass of 4 kilograms of air in a piston-cylinder assembly undergoes two processes in series from an initial state where p₁ = 0.3 MPa, T₁ = 211°C:

Process 1–2: Constant-temperature expansion until the volume is twice the initial volume.

Process 2–3: Constant-volume heating until the pressure is again 0.3 MPa.

Assuming ideal gas behavior, determine the temperature at state 3, in kelvin.

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Question 2

Carbon dioxide (CO₂) contained in a piston–cylinder arrangement, initially at 6 bar and 488 K, undergoes an expansion to a final temperature of 201 K, during which the pressure–volume relationship is pV^1.4 = constant. Assuming the ideal gas model for the CO₂, determine the final pressure, in bar.

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Question 3

A piston–cylinder assembly contains air, initially at 0.5 bar, 139 K, and a volume of 0.6 m³. The air undergoes a process to a state where the pressure is 0.6 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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Question 4

Carbon monoxide (CO) contained in a piston–cylinder arrangement, initially at 8.5 bar and 439 K, undergoes an expansion to a final temperature of 284 K, during which the pressure–volume relationship is pV^1.3 = constant. Assuming the ideal gas model for the CO, determine the work in kJ/kg.

Answer 1