Find mass of air and how high does the pressure become, Mechanical Engineering

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Find mass of air and how high does the pressure become

Air in a piston-cylinder device has 400 degrees F, 1000 kPa, with a volume of 3.5 ft^3. Combustion heats it to 1500 K in a constant-volume process. What us the mass of air (lbm), and how high does the pressure become (psia)? Show the process on both a P-v and T-v diagram.

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