The disinfection of drinking water to control microbial contaminants can form ch

Question

The disinfection of drinking water to control microbial contaminants can form chemical disinfection byproducts. These compounds result from the reaction of chlorine with naturally occurring organic matter (the yellow-green "stuff" in natural water). One class of disinfection byproducts is the malodorous and unpalatable chlorophenols. 2,4- dichlorophenol is one compound of this class. a) Calculate the vapor pressure pit and pis' of 2,4-chlorophenol at 40 C using To and structural information only (Eqs 8-19, 8-23). OH CI Mi 163.0 g/mo Tm 43.7 °C Tb 213.0 °C Later you find in the CRC Handbook of Chemistry and Physics the following information on 2,4-dichlorophenol. T (C) Po (mm Hg) P) 53.0. VS 92.8 10 TRI 123.4 40 46.0 100 187.5 400 210.0 760 a) Calculate the vapor pressure, p in atmosphere and in pascal of 2,4-dichlorophenol at 40 "C using the vapor pressure-temperature data given in the table above. b) Compare the value for pu with the value obtained in 1a) c) From these data in the table, calculate AvapH (in kJ/mol) for 2,4-dichlorophenol d) From these data, also calculate AvapSi (in J/molK) for 2,4-dichlorophenol (Hint: there is a relationship between AvapHi and Avapsi at Tb.

Explanation / Answer

TB (2,4 DICHLOROPHENOL)-Tb (Water )=delta Tb=213 deg C-100 deg C

=113 deg C=Kb *m (molality of 2,4 dichlorophenol )

113=3.6 *m

m=113/3.6

=31.4

Vapour pressure of 2,4 dichlorophenol=

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