The Clean Air Act prohibited the production of chlorofluorocarbons (CFCs) in the United States as of 1996. One widely used CFC, refrigerant R-12, has been replaced by R-134a in many applications because of their similar properties, including a low boiling point at atmospheric pressure, T_sat, = 243 K and 246.9 K for R-12 and R-134a, respectively. Compare the performance of these two refrigerants under the following conditions. The saturated refrigerant vapor at 310K is condensed as it flows through a 30-mm-diameter, 0.8-m-long tube whose wall temperature is maintained at 290 K. If vapor enters the tube at a flow rate of 0.010 kg/s, what is the rate of condensation and the flow rate of vapor leaving the tube? The relevant properties of R -12 at T_sat = 310 K are Pv = 50.1 kg/m³, h_fg = 160 kJ/kg, and μ_v = 150 x 10^-7 N ∙ s/m² and those of liquid R-12 at T_f = 300 K are P₁ = 1306 kg/m³, c_p,1 = 978 J/kg ∙ K. μ₁ = 2.54 x 10^-4 N ∙ s/m², k _l = 0.072 W/m ∙ K. The properties of the saturated R-134a vapor are Pv = 46.1 kg/m³, hfg = 166 kJ/kg, and μ_v = 136 x 10^-7 N ∙ s/m².