Consider a system in which R 134-A is moved through an evaporator. The evaporator removes energy from the the surroundings at a rate of 0.54 kW. P = 120 kPa and x = 0.2 right before the fluid enters the evaporator. After exiting the evaporator, P = 120 kPa and T = -20 C. What is the mass flow rate through the evaporator?