Chapters11and12Key - Chemistry 162 Study Guide Chapters 11...

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Chemistry 162 Study Guide page 1 3/9/2009 1. Silver crystallizes in the face-centered cubic system. If the edge of the unit cell is 4.07 Å , what is the radius of a silver atom in angstroms (1Å = 10 -8 cm)? FCC has a face diagonal composed of 4 radii of the atom comprising the cell. By pythagorean theorem the face diagonal, FD = 2 x Edge length Thus: 4 x radius = 2 x 4.07 Å radius = ( 2 x 4.07 Å)/4 = 1.44 Å 2. In order to prepare a standard 1.00 molal solution of oxalic acid from H 2 C 2 O 4 2H 2 O (molar mass = 127.07 g/mol), 127.07 g of oxalic acid dihydrate should be dissolved in a. 1000 cc of water. b. 1000 g of water. c. 964 g of water. molality is moles/kg solvent and 36g of water were added from the 127g of the dihydrate. d. enough water to make 1000 mL of solution. e. enough water to make 1000.0 g of solution. 3. How many moles of ethanol must be dissolved in one hundred grams of water to give a 1.5 molal solution? a. 15 b. 1.5 c. 0.15 d. 0.015 e. 0.0015 4. Which type of solid would be the most soluble in carbon tetrachloride? a. ionic b. polar molecular c. nonpolar molecular d. network covalent e. metallic carbon tetrachloride is a non-polar molecular solvent and “like dissolves like” 5. Which one of the following is not a colligative property or related to colligative properties? a. osmotic pressure b. molality c. density d. freezing-point depression e. molarity 6. When 0.100 mol of urea, a nonelectrolyte whose MW = 60.1 and whose density = 1.48 g/cc, is dissolved in 50.0 g of water the molality of the solution is? Then calculate the freezing point depression and the boiling point elevation for the resulting solution. m = moles/kg solvent; thus m = 0.100/0.0500 kg = 2.00 molal T f = i K f m = 1 x 1.86 C/m x 2.00 m = 3.72 C T b = i K b m = 1 x 0.52 C/m x 2.00 m = 1.04 C so the new freezing point is - 3.72 C and the new boiling point is 101.04 C 7. The vapor pressure of a solution containing a nonvolatile solute is directly proportional to the a. mole fraction of the solute. b. mole fraction of the solvent . c. molarity of the solvent. d.
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Chapters11and12Key - Chemistry 162 Study Guide Chapters 11...

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