0.5-lbm of a saturated vapor is converted to a saturated liquid by being cooled in a weighted piston- cylinder device maintained at 50 psia. During the phase conversion, the system volume decreases by 1.5 ft3; 250 Btu of heat are removed; and the temperature remains fixed at 15oF. Estimate the boiling point temperature of this substance when its pressure is 60 psia.

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Weight 0 50 psia 15°F 0.5 lbm sat. vapor