[13] (a) When a certain freon used in refrigeration was expanded adiabatically from an initial pressure of 32 atm and 0 °C to a final pressure of 1.00 atm, the temperature fell by 22 K. Calculate the Joule-Thomson coefficient, μ, at 0°C, assuming it remains constant over this temperature range. (b) To design a particular kind of refrigerator, we need to know the temperature reduction brought about by adiabatic expansion of the refrigerant gas. For one type of freon, μ= 1.2 K atm-1. What pressure difference is need to provide a temperature drop of 5.0 K? (c) The volume of a certain liquid varies with temperature as V = V'{0.77 +3.7 x 104 (T/K) +1.52 x 104 (T/K)2}where V' is its volume at 298 K. Calculate its expansion coefficient, a, at 310 K.