Question: A piston-cylinder device is connected through an initially closed valve to a line carrying steam at 300 psia and 700F. The cylinder initially contains 0.25

A piston-cylinder device is connected through an initially closed valve to a line carrying steam at 300 psia and 700F. The cylinder initially contains 0.25 lbm of saturated water at 160 psi. In a constant pressure process, maintained by the weight of the plunger, steam enters the cylinder until its contents reach 550F, while simultaneously 90Btu of heat is lost through the cylinder walls. Determine the amount of mass entering the cylinder in lbm.

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