5.87. Three hundred kilograms per hour of air flow through a countercurrent heat ex- changer as shown in Figure P5.87. Two hundred thirty kilograms per hour of potassium carbonate solution are heated by the air. Assume that the heat ex- changer has negligible heat losses. The terminal temperatures are given in Fig- ure P5.87. Calculate the temperature, in kelvin, of the exit potassium carbonate stream. 127° C- 300 kg/hr Air 227° C Heat Exchanger 27°C 230 kg/hr Tout = ? 2.5% K₂CO3 19°C. 97.5% H₂O Figure P5.87