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# Po A cylinder/piston arrangement contains 5 kg of water at 100 C with x= 20%. Initially the piston of mass m, 75 kg rests

## Po A cylinder/piston arrangement contains 5 kg of water at 100 C with x= 20%. Initially the piston of mass m, 75 kg rests on a set of stops (see figure). The outside pressure is 100 kPa, and the area of the piston is 24.5 cm. Heat is now added until the water reaches a saturated vapor state. Find the initial volume, final pressure and total work done by the water. Use for your calculations the following models: To estimate saturation pressures or saturation temperatures, use the Antoine equation (appendix A of textbook) HO To estimate , the specific volume of the saturated liquid, use the Rackett equation (equation 4.73 of textbook) To estimate v., the specific volume of the saturated vapor, use the virial equation of state truncated at the second virial coefficient B: P B B'P RT (Note: BB') Use the Abbott's correlation to estimate the second virial coefficient: RT [80) + B)] B= P 0.422 B(0)=0.083- T16 B)=0.139-0.172 1,42

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