70. Solving a chemistry problem

10. Determine the partial concentration of chromium oxide sol with a mass concentration of 0.08 kg/m3 using the following data: diffusion coefficient D is 2.5*10-12 m2/s, medium viscosity η = 1.5 mPa*s, temperature t = 20 0C, hydration layer thickness δ =1.8 nm, chromium oxide density ρ = 5.6 g/cm3.