t Water Contamination by Dichlobenil The herbicide dichlobenil (2,6-dichlorobenz

Question

t Water Contamination by Dichlobenil The herbicide dichlobenil (2,6-dichlorobenzonitrile, CTH3Cl2N) has a solubility of 18.0 m by mass in water at 20 o C. The herbicide disintegrates with a half-life (first order) of 1.00 year. Suppose that 317 kg of dichlobenil is applied in the fields surrounding a 7.50-acre pond having an average depth of 3.00 ft. Suppose further that half of the dichlobenil permeates into the pond and that this happens within a few days. Assume that the density of the pond water is 1.00 e following conversion factors will be helpful 1 acre E 43, 560 ft 2 1 ft 12 in 1 in 2.54 cm. 1 mL 1 cm 1fta 28,317 cm3 Express your answer numerically in parts per million. 10.3 ppm Submit Hints My Answers Give Up Review Part Correct Part D Once the pond becomes saturated in dichlobenil, how many molecules of the herbicide will be dissolved per liter of pond water? Express the number of molecules numerically. molecules Submit Hints My Answers Give Up Review Part

Explanation / Answer

solubility = 18mg/L
1 liter of saturated pond water contains 18mg of Dichlobenil
Molar mass of Dichlobenil(C7H3Cl2N) = 7*12+3*1+2*35.45+14 = 171.9 gm/mole
Number of molecules in 18mg Dichobenil = 0.018/171.9 = 0.105milli moles = 0.105E-3*6.02E23 = 0.632E20

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