Homework Answers
Answer:
Option 2: In the opposite direction as the increase in concentration.
Explanation:
Flick's first law can be denoted as :
J (matter) = - D (dN/dz)
Here, J = diffusive mass flux of a species.
D = Diffusion coefficient (diffusivity)
N = Conc. of the diffusing species in number of moles per unit
z = distance
and (dN/dz) = distance of concentration gradient of diffused material in z direction.
Now the Negative sign in the equation indicates that the diffusive flux is in the opposite direction of the concentration gradient.
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