A rigid tank contains a partition that divides the tank into two sections, each having a volume of 2 ft3 . The left side contains 1.5 lbm of refrigerant R-134a at a pressure of 50 psia, and the right side contains 2 lbm of refrigerant R-134a at 30 psia. The partition is removed and the contents are allowed to mix. Heat transfer occurs with the surroundings until the entire tank contents reach a new equilibrium temperature of 20 °F. For this process determine: a) the initial temperature of the left and right sections (°F), b) the final pressure in the tank (psia), c) the amount of heat transfer to or from the system when it reaches equilibrium in the final state (Btu).