Assignment 2

Assignment 2 - regulatory standard of 220ppm HC into µg/m...

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ES 462 Assignment 2 1. Describe the difference between a) accuracy and precision and b) method detection limits and practical quantitation limit 2. A water sample has 10µg/L Hg 2+ and a density of 1.0g/mL. [atomic weight of Hg=200.59]. Calculate the following: a) Hg 2+ in ppb, b) Hg 2+ in µM, and c) the number of Hg 2+ ions in 1L. (Avogadro’s number = 6.022 x 10 23 /mol). 3. Carbon monoxide (CO) and hydrocarbons (HC) are the two main exhaust gases produced by the combustion of gasoline-powered vehicles. Their concentration are regulated by required car inspections (in some states); a) convert the
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Unformatted text preview: regulatory standard of 220ppm HC into µg/m 3 (assuming a nominal molecular weight =16). b) If the actual exhaust concentration of CO (MW=28) at low speed emission test is 0.16%, what is the CO concentration in ppm and mg/m 3 . 4. The exhaust gas from an automobile contains 0.002% by volume of nitrogen dioxide (MW=46). What is the concentration of NO 2 in µg/ m 3 at standard temperature and pressure (25 deg C and 1atm pressure)?...
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