A drug has a Stokes-Einstein radius of 0.6 nm. What is its diffusivity (cm 2 s −1 ) in a solvent at 20°C having a viscosity of 0.8 cP? The diffusivity of a molecule in a solvent at 25°C was...

A drug has a Stokes-Einstein radius of 0.6 nm. What is its diffusivity (cm²
s⁻¹) in a solvent at 20°C having a viscosity of 0.8 cP?

The diffusivity of a molecule in a solvent at 25°C was experimentally found to be equal to 4 × 10⁻⁶
cm²
s⁻¹. The viscosity of the solvent at these conditions is 0.86 cP. Estimate the molecular radius of this molecule in nanometers (nm).