Sugar and powdered sugar crystals have a cubic shape with 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 specific surface (m2/g) and the number of particles in 1 kg. The density of sugar is 1.60 g/cm3.

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