Assignment 2-solution - Assignment#2 1 The current federal...

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Assignment #2 1. The current federal primary standard for ozone is published as 0.08 or 170 . What temperature has been assumed for this equivalency? Assume the pressure to be 1 atmosphere. Solution #1 : ( ) ( ) C ( ) ( ) ( ) K = 275 K or 2 2. The atmospheric column contains 280 DU of ozone over the eastern United States on a certain day. A ground-level ozone monitor shows a concentration of 0.05 , which is assumed to be uniform up to a temperature inversion height of 700 m. Assume p = 1 atmosphere and T = 300 K for that region below 700 m. What fraction of the ozone molecules in the total atmosphere column are below the inversion height? Solution #2 : Given: Ozone contained in atmospheric column over the site of concern = 280 DU Concentration of ozone at ground level = 0.05 ppm Temperature inversion height = 700 m Pressure = 1 atm Temperature = 300 K ( For region below 700 m) 1 DU = 2.69 ( ) Hence 0.05 ppm = 0.05 molecules of ozone per molecule of air
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Number of molecules of ozone per unit earth's surface area = ( ) = ( ) = 2.44 molecules of ozone per of earth's surface Volume of air for 1 earth's surface = ( ) = 0.07 number of molecules of air = ( ) = 1.71 molecules of air per of earth's surface Concentration of ozone up-to a height of 700 m = ( ) = 3.50 DU Fraction of ozone molecules below inversion height = ( ) = 1.426 Hence below the inversion height we have 1.426 molecules of ozone per million air molecules. Therefore, fraction of ozone below inversion height = = 1.25 %.
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