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(a) A seed crystal of diameter D(mm) is placed in a solution of dissolved salt, and new crystals are observed to form at a constant rate of r (crystals /min). Experiments run with seed crystals of different sizes show that the rate of formation of new crystals varies with the seed crystal diameter according to r(crystals/min)=200D10D2(Dinmm) Determine the units for the constants 200 and 10, and derive the formula for r (crystals/s) in terms of D (inches). (6 marks) (b) A mixture of gases has the following molar composition: N265%;O218%;NH39% and H2O8%. (i) Calculate the composition in mass \%. (ii) Calculate the volume in m3 of 10kg of the mixture at 873K and 10 atm gauge pressure. 5 marks) (4 marks) Molecular weights: N228;O232;NH317;H2O18 1 (c) The following data extracted from the Steam Tables shows the values of specific volumes of steam, V^(ft3lb1) at temperatures between 450 and 700F and pressures between 50 and 95psia. By repeated interpolations, determine the change in volume, V when one lb of steam is cooled from 640F and 92 psia to 480F and 52 psia