d) Section 4. Box Modeling 47 For an organic chemical of interest, the \"dimensi
ID: 703661 • Letter: D
Question
d) Section 4. Box Modeling 47 For an organic chemical of interest, the "dimensionless" Henn's Law constant (H/RT) is 3 Cair/Cwater A system has 5 mL of air and 15 mL of water. What is the fraction of the chemical is in the air in this system? For the system for the above problem, if some of this chemical was spilled into a river, will the chemical tend to stay in the water or volatilize to the atmosphere? (so that the water will soon be safe to drink) 48 Say a sample of gasoline contains 0.05mols of benzene, and 0.95 mols of everything else. Say the vapor pressure What is the gas phase pressure of benzene above the 49 of pure benzene at the temperature of interest is O.1 atm. gasoline in atm? o If the temperature is 298 K, what is the concentration of benzene in the gas phase in units of ug/m'? the value of the gas constant R is 0.082 L-atm/mol-K MW of benzene - 78 g/mol S The solubility of pure liquid benzene in water is 1780 mg/l at 25 C. For the same gasoline as from the above problem, what is the concentration of benzene in mg/L in water that comes into contact with the gasoline?Explanation / Answer
Ans 51:- Here Mole fraction of benzene XA = 0.05/1.00
= 0.05
Given Vapour pressure P0A = 0.1atm
PA = P0A XA
= 0.1 x 0.05
= 0.005atm
R= 0.0821
T= 25oC
= 298K
Therefore Concentration of benzene in water that comes in contact with gasoline
C= XA PA /RT
= 0.05 x0.005/0.0821x298
= 1.02183x10-5 g/L
=1.02183x10-2mg/L
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