Problem 2 (40 points) Raindrops falling in Ho Chi Minh City may be contaminated owing to the absorption of gaseous pollu

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Problem 2 40 Points Raindrops Falling In Ho Chi Minh City May Be Contaminated Owing To The Absorption Of Gaseous Pollu 1 (44.46 KiB) Viewed 45 times

Problem 2 (40 points) Raindrops falling in Ho Chi Minh City may be contaminated owing to the absorption of gaseous pollutants (which are water soluble) while falling through the air. Suppose the average SO₂ concentration in the air over Ho Chi Minh City is around 0.000038 volume percent. The mass transfer coefficient for SO₂ transport in the air to the surface of the drops (k.) is 5 cm/s. The diffusivity of SO₂ in water is 0.000025 cm³/s. The temperature is 60 F and the pressure is I atm. Dilute solutions of SO₂ in H₂O obey Henry's Law, i.e., P=H.C Nu p is the vapor pressure of SO₂ in equilibrium with the water solution in which the SO₂ concentration is C and H is Henry's constant. For SO₂, H= 180 cm³-atm/gmole. What is the SO₂ concentration in rain drops, 0.15 cm in diameter, reaching the ground after falling for 4 minutes in the air?