help with the following questions

25. A seed crystal of diameter D(mm) is placed in a solution of dissolved salt, and new crystals are observed to nucleate (form) at a constant rate r (crystals/min). Experiments with seed erystals of different sizes show that the rate of nucleation varies with the seed crystal diameter as r(crystals/min)=200D10D2(Dinmm) (a) What are the units of the constants 200 and 10? (Assume the given equation is valid and therefore dimensionally homogeneous.) (b) Calculate the erystal nucleation rate in crystais/s corresponding to a crystal diameter of 0.050 inch. (c) Derive a formula for r (crystalsis) in terms of D (inches). (See Example 2.6-1.) Check the formula using the result of part (b). 26. The density of a fluid is given by the empirical equation =70.5exp(8.27107P) where is density (1bm/ft3) and P is pressure (lb/iin2). (a) What are the units of 70.5 and 8.27107 ? (b) Calculate the density in g/cm3 for a pressure of 9.0010N/m2. (c) Derive a formula for (g/cm3) as a function of P(N/m2). (See Example 2.6-1.) Check your result using the solution of part (b)