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Question 12.5.1: Calculation of the Air-Water Partition Coefficient Given tha...

Calculation of the Air-Water Partition Coefficient

Given that the extrapolated vapor pressure of liquid benzo[a]pyrene is 2.13 \times 10^{-5} Pa at 25°C and the value of its infinite-dilution activity coefficient in water, \gamma_{ BP }^{\infty}=3.76 \times 10^{8}, found in Illustration 12.1-3, determine its air-water partition coefficient.

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\begin{array}{l}K_{ AW , BP }\left[\frac{\frac{ g _{ BP }}{ m _{ A }^{3}}}{\frac{ g _{ BP }}{ m _{ W }^{3}}}\right]=0.2164 \frac{\gamma_{ BP }^{\infty} P_{ BP }^{ vap }}{T}=0.2164 \times \frac{3.76 \times 10^{8} \times 2.13 \times 10^{-5} Pa }{298.15} \times \frac{1 bar }{10^{5} Pa }\\=5.844 \times 10^{-5}\end{array}

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