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Chem 171 F10 Q2 Density Chrom Key

# Chem 171 F10 Q2 Density Chrom Key - Chem 171 Quiz 2 Version...

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Chem 171 Quiz 2 Version A (Key Density/Chromatography) 1. In normal blood, there are about 5.4 x 10 9 red blood cells (rbc) per mL. The volume of a red blood cell is about 90.0 x 10 -12 cm 3 and its density is 1.096 g/mL. How many liters of whole blood would be needed to collect 0.5 kg of red blood cells? Vol of rbc per mL of blood = 5.4 x 10 9 rbc x 90.0 x 10 -12 cm 3 /rbc = 0.486 mL Mass of rbc per mL of blood = 0.486 mL x 1.096 g/mL = 0.533 g Vol of blood = 500 g rbc x 1mL blood /0.533 g rbc = 938 mL Vol of blood in Liters = 938 mL x 1L/1000 mL = 0.938 L Vol of blood to correct no. of sig fig. = 0.9 L 2. In the experiment entitled “Paper Chromatography”, you will be performing two paper chromatograms. What is the purpose of each paper chromatogram? The first chromatogram will be used to find where various metal ions will be located in this solvent system. The retention or retardation factor will be calculated The second chromatogram will be run using unknown (analyte) solutions each containing one or more metal ions. Chem 171 Quiz 2 Version B 1. The diameter of metal wire is often referred to by its American wire-gauge number. A 16-gauge wire has a diameter of 0.05082 in (1 in = 2.54 cm). What length of wire, in meters is found in 454 g spool of 16-gauge copper wire? The density of copper is 8.92 g/cm 3 ? (V cylinder = π r 2 l ) Vol of spool = 454 g x 1cm 3 /8.92 g = 50.9 cm 3

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Chem 171 F10 Q2 Density Chrom Key - Chem 171 Quiz 2 Version...

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