An evaporator is fed continuously with 25 t (metric tons)/h of a solution consisting of 10 percent NaOH, 10 percent NaCl, and 80 percent H₂O. During evaporation, water is boiled off, and salt precipitates as crystals, which are settled and removed from the remaining liquor. The concentrated liquor leaving the evaporator contains 50 percent NaOH, 2 percent NaCl, and 48 percent H₂O. Calculate 

(a) The kilograms of water evaporated per hour, 

(b) The kilograms of salt precipitated per hour, and 

(c) The kilograms of concentrated liquor produced per hour.