Q2key - Chem 171 Quiz 2 Version A 1 A 32.65 g sample of a solid is placed in a flask Toluene in which the solid is insoluble is added to the flask

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Chem 171 Quiz 2 Version A 1. A 32.65 g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.00 mL. The solid and toluene together weigh 58.58 g. The density of toluene at the temperature of the experiment is 0.864 g/mL. What is the density of the solid? (5 pts) Mass of toluene = 58.58 g – 32.65 = 25.93 g Volume of toluene = 25.93 g x 1mL/0.864 g = 30.01 mL Volume of solid = 50.00 – 30.01 = 19.99 mL Density of solid 32.65 g / 19.99 mL = 1.63 g/mL 2. Explain why separation occurs in chromatography? (5 pts) A mixture of solutes in a mobile phase pass through a selective adsorbing medium, the stationary phase. As the mobile phase (a gas or a liquid) migrates through the stationary phase, separation occurs because the solutes have different affinities for the two –phased system, made of the mobile and stationary phases. This difference in affinities results in the separation of the solutes . Chem 171 Quiz 2 Version B
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This note was uploaded on 02/05/2012 for the course 160 171 taught by Professor Staff during the Spring '08 term at Rutgers.

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Q2key - Chem 171 Quiz 2 Version A 1 A 32.65 g sample of a solid is placed in a flask Toluene in which the solid is insoluble is added to the flask

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