(b) An evaporator is to be fed with 1500kg/hr of a solution containing 2% solute by weight at a temperature 45C. It is to be concentrated to solution of 3% solute by weight in the evaporator operating at a pressure of 101.3kPa in the vapor space. The heating surface is supplied with saturated steam at 198.54kPa(ts=120C). Calculate the weight of the vapor produced, and the weight of the steam required. Also calculate the necessary heating surface. The solution is so dilute that its specific heat, latent heat and boiling point may be assumed to be the same as those of water. hF=188.4kJ/kg,hL=419.1kJ/kg,Hv=2676kJ/kg,Hs=2706kJ/kg,hs=503.7kJ/kg