8 a piston cylinder device contains 0 85 kg of refrigerant 134a at 10
8. A piston-cylinder device contains 0.85 kg of refrigerant-134a at -10 °C. The piston that is
free to move has a mass of 12 kg and a diameter of 25 cm. the local atmospheric pressure
is 88 kPa. Now, heat is transferred to refrigerant-134a until the temperature is 15 °C.
Determine (a) the final pressure (b) the change in the volume of the cylinder and (c) the
change in the enthalpy of the refrigerant-134a.
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