211_practice midtermI_05

211_practice midtermI_05 - Name_ Practice Midterm I...

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1 Name__________________________________ Practice Midterm I Chemistry 211 1. (30 points) An adrenal cell has about 2.5 x 10 4 vesicles that contain epinephrine. a. An entire cell has ~ 150 fmol (f = femto = 10 -15 ) of epinephrine. How many amol (a = atto = 10 -18 ) of epinephrine are in each vesicle. b. How many molecules of epinephrine are in each vesicle? c. One liter is equal to 10 -3 m 3 . The volume of a sphere of radius r is (4/3) π r 3 . Find the volume of a spherical vesicle of radius 200 nm. Express your answer in SI units (m 3 ). d. Find the molar concentration of epinephrine in the vesicle if it contains 10 amol of epinephrine.
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2 2. (25 points) Hydrocarbons in the front seat of an automobile were measured during trips on the New Jersey Turnpike and trips through the Lincoln Tunnel connecting New York and New Jersey. Assume that the standard deviations of the data sets are statistically the same. The total concentration of m - and p -xylene were Turnpike: 31.4 ± 30.0 µ g/m 3 (32 measurements)
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This note was uploaded on 07/17/2008 for the course CHEM 211 taught by Professor Allen during the Summer '06 term at Ohio State.

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211_practice midtermI_05 - Name_ Practice Midterm I...

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