I Need solution of Q. 3

3. Determine the diffusion coefficient of ethanol in water and in air at 25C. Compare the two values and comment. Next, calculate the time it would take for ethanol to travel in water and in air to a distance of 1m if diffusion was the only transport mechanism. 4. The herbicide atrazine is accidentally spilled into a river, resulting in 80g/L atrazine concentration in the water column at the site of the spill. The intake of a local drinking water supply is located 15km downstream of the site of the accident. The average river flow velocity is 0.5m/s and the dispersion coefficient is 50m2/s. Assuming steady-state conditions in the river and that advection is the dominant transport mechanism, approximately how long will it take for the chemical to reach the drinking water intake? Assume that no transformation of atrazine will occur