ENV 6015 Diffusion Problem Set1.Salt water containing 11700 mg/l of NaCl (0.2 mole per liter) lies beneath a one-foot lens of fresh water, which is essentially, salt free to begin with. Find the concentration of NaCl in the lens after 30 days contact. Assume a constant temperature of 15oC. 2.The initial dissolved oxygen concentration of an acquiescent body of water 1-foot deep is 5.0 mg/L. Assume the rate of absorption of oxygen from the atmosphere is sufficiently fast to saturate the surface layer of the water in a relatively short period. Find the concentration after one week if the temperature of water remained constant at 15oC. 3.Sucrose solution to 20oC has a viscosity n3= 1.01 x 10-2gm cm-1sec-1. If the density of sucrose is 1.59 gm/cm3and diffusivity D1= 0.36 cm2/day determine the molar concentration of the solution. Also, determine the molecular diameter. 4.An experimental channel of 200 ft. long 2.5 ft. wide and 2 ft. deep was used for dye studies. The water depth in the flume was 1.0 ft and the stream flow was kept constant at a rate of
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