An ammonia solution at a high pressure is flash-vaporized at a rate of 200lbm/h. The solution contains 0.70lbm NH3/lbm, and its enthalpy relative to H2O (1, 32°F) and NH3 (1, —40°F) is —50 Btu/lbm. Liquid and gas streams emerge from the unit at 1 atm and 80°F. Use Figure 8.5-2 to determine the mass flow rates and ammonia mass fractions of the vapor and the liquid product streams and the rate (Btu/h) at which heat must be transferred to the vaporizer.