A piston cylinder is filled with .85 kg of refrigerant-134a at -10 degrees Celsius. The piston moves freely, and has a mass of of 12 kg and a diameter of 25 cm. Heat is added to the closed system (the refrigerant) until the temperature rises to 15 degrees Celsius.
A) How far did the piston move (use interpolation)?
B) What is the change in enthalpy of refrigerant 134a?