2) (30 points) A solution of 15% by weight of magnesium sulfate is mixed with the recycle stream and enters an evaporator where some water is evaporated, and it is saturated at 90C by 85%. . ater, this solution is cooled in a crystallizer up to 20C and 190kg of MgSO47H2O crystal is obtained per hour. 85% of the magnesium sulphate in the solution entering this system is separated in crystal form. A part of the saturated solution coming out of the crystallizer is discarded for cleaning purposes, the remaining part is recycled and mixed into the newly arrived solution. Thus, a) Calculate the mass of discarded solution in one hour. b) Calculate the mass of water evaporated in one hour. c) Calculate the mass of recycled solution in one hour. Solubility values: At 20C:35.5kgMgSO/100kgH2O At 90C269kgMgSO4/100kgH2O QUESTIONS (20) 1-a) Describe the preparation of 2L of 0.12MHClO4 from the commercial reagent [71% HClO4(w/w)d:1.67](MwHClO4:100.5g/mol) b) What is the mass in grams of solute in 1b. 37mL of 5.75.104M benzoic acid (C6H5COOH)(Mw:122g/mol) 2b. 4.50L of a solution that contains 31.7ppm of SnCl2