Quiz2key_Sp10

# Quiz2key_Sp10 - CEE 320 Environmental Engineering Quiz#2 F...

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CEE 320 Quiz #2 Environmental Engineering F 5 February 2010 PLEASE WRITE YOUR NAME ON THE BACK Quiz #2 solution key Potentially useful data 1000 L = 1 m 3 Formula weight of chloroform (CHCl 3 ): 119 g mole -1 1 μ g = 10 -6 g PV = nRT where R = 82.05 x 10 -3 mol -1 L atm K -1 Density of water: 1 g mL -1 = 1 kg L -1 = 1,000 kg m -3 UNIT CONVERSION EXERCISE AND EXPOSURE PATHWAYS Note: be sure to show your work! Tossing down an answer will not give you full credit. You must show how you arrived at your answer. (a) In Appleton, Wisconsin, the median indoor airborne concentration of chloroform (CHCl 3 ) was found to be 0.35 μ g m -3 . Convert this concentration to a mole fraction in parts per billion (ppb) assuming that T = 293 K and P = 1 atm. X = mole fraction in ppb X = C CHCl 3 C air 10 9 C CHCl 3 = 0.35 μ g m 3 ( ) 10 6 g μ g ( ) 1 mol 119 g ( ) = 2.94 × 10 9 mol m 3 C air = 1 atm 82.05 × 10 3 atm L mol K ( ) 293 K ( ) = 4.16 × 10 2 mol L ( ) 1000 L m 3 ( ) = 41.6

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Quiz2key_Sp10 - CEE 320 Environmental Engineering Quiz#2 F...

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