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Chem_171_Su_08_Q2_Density_Emp_Key_Posted-967

# Chem_171_Su_08_Q2_Density_Emp_Key_Posted-967 - Chem 171...

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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 Chem 171 Quiz 2 Version B 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? (5 pts) 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 .

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Chem_171_Su_08_Q2_Density_Emp_Key_Posted-967 - Chem 171...

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