1. The problem statement, all variables and given/known data In a simple model of diffusion in one dimension the quantity D can be shown to be given by half the product of the mean free path and the rms speed of the diffusing particle. Calculate the average distance a molecule of insulin will diffuse in water in one hour if its diffusion coefficient is 8.2 × 10−7 cm^2/s. 2. Relevant equations J = −D(dc/dx) Diffusion length = (2 x D x t)^0.5 -Einsteins Do I need the mean free path and rms speed equations here? 3. The attempt at a solution The thing confusing me is the wording of the problem, do I need to use the mean free path and rms speed equations or is the question just making a statement? Can I get away with subbing in D and t = 3600s? Is that finding the same thing - in that case the answer would be Diffusion Length = (2 x 8.2 × 10−7 cm2/s. x 3600s)2 = 0.07683749085cm/hour? Thanks in advance.