Chem 171 F09 Q2 Density Chrom Key

Chem 171 F09 Q2 Density Chrom Key - Chem 171 Quiz 2 Version...

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Chem 171 Quiz 2 Version A 1. An empty vial weighs 55.32 g. If the vial weighs 185.56 g when filled with liquid mercury (d=13.53 g /cm 3 ), what is its volume in mL? How much does the vial weigh if it were filled with water (d = 0.997 g /cm 3 at 25 o C. Mass of mercury = 185.56 g – 55.32 g = 130.24 g Volume of vial = 130.24 g x 1 cm 3 / 13.53 g = 9.626 cm 3 = 9.626 mL Mass of water = 9.626 mL x 0.997 g / cm 3 = 9.597 g Mass of the vial in g = 55.32 g +9.597 g = 64.917 g =64.92 g 2. Discuss in detail the principle of chromatography. A mixture of solutes in a mobile phase pass through or over a selective absorbing medium, the stationary phase. As the mobile phase migrates through the stationary phase, separation occurs because the solutes have different affinities for the two-phased systems (the mobile and the stationary parts) Chem 171 Quiz 2 Version B 1. A small cube of aluminum measures 15.6 mm on a side and weighs 10.250 g. What is the density of aluminum in g / mL? V = l 3 . 15.6 mm x 1 cm / 10 mm = 1.56 cm V = (1.56 cm) 3 = 3.80 cm 3 3.80 cm 3 = 3.80 mL Density = 10.250 g / 3.80 mL = 2.70 g / mL 2. Identify the stationary phase and the mobile phase in paper chromatography.
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