A closed piston-cylinder device submerged in a constant temperature bath arrange

Question

A closed piston-cylinder device submerged in a constant temperature bath arranged to maintain 200 C initially contains 0.02 liters of liquid water and 2 liters of water vapor. The volume of this apparatus is now allowed to change until the volume of its contents is double the original volume.

A) What is the final pressure?

   a) 100 kPa

   b) 635 kPa

   c) 1.40 MPa

   d) 1.55 MPa

B) What is the mass of the apparatus?

   a) 9.9330 kg

   b) 0.0416 kg

   c) 0.0502 kg

   d) 0.0613 kg

C) What is the change in the water's specific internal energy? (u_2-u_1)

    a) 452 kJ/kg

   b) 562 kJ/kg

   c) 673 kJ/kg

   d) 850 kJ/kg

D) How much specific work does this system produce?

   a) -63.2 kJ/kg

   b) 63.2 kJ/kg

   c) 75.9 kJ/kg

   d) 95.6 kJ/kg

E. How much heat per unit mass is transferred to this apparatus during this process?

    a) 625 kJ/kg

   b) 749 kJ/kg

   c) 946 kJ/kg

   d) -913 kJ/kg

Explanation / Answer

a)  635 kPa

b) 0.0502 kg

c) 452 kJ/kg

d) 63.2 kJ/kg

e) 946 kJ/kg

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