Question 4 (worth 3 points) Batch drying of a solid between Xo = 0.32 kg of water/kg of dry solid and Xf = 0.16 kg water/kg dry solid took 4 hours. Knowing that Xc and X* are, respectively, 0.14 and 0.04 kg of water/kg of dry solid. a) Draw the drying curve approximately, justify your assumptions. b) If a solid with a final moisture content of 0.08 kg water/kg dry solid is desired, determine the time it would take to dry. c) Determine the drying time (in the constant drying rate period) if the diameter of the (spherical) particles of solids is reduced by half, keeping all the rest equal.