1. Solving a chemistry problem

226. Crystals of sugar and powdered sugar have a cubic shape with an edge length (m): 2*10-3; 1*10-4 ; 6*10-5; 3*10-6; 5*10-7; 4*10-8; 7*10-9. Calculate their dispersion, specific surface area and number of particles in 1 m3. The density of sugar is 1.60*103 kg/m3.