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# Lecture Notes/Practice Questions wtih Answers - 6(10 points...

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Practice TEST

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1. (6 points)List all the intermolecular forces present in a) chloroform (CHCl 3 ) DD, LD b) Ethanol (CH 3 CH 2 OH) DD, LD, Hydrogen c) Iodine (I 2 ) LD 2. (8 points)A solution contains 1.0 g of sucrose (MW = 342.3 g/mol) dissolved in 20 g of water. The freezing point depression constant of water is 1.86 °C/m. Calculate the freezing point of the solution. Tf = -0.27 C 3. (10 points)You have a 2 M solution of NaCl (aq). Density = 1.2 g/mL. Express the concentration of this solution in weight percent. (MW of NaCl = 58.44g/mol) Weight percent = 9.74 %
6. (10 points)

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Unformatted text preview: 6. (10 points) When 2 g of an unknown solute is added to 1 mole of Benzene, the vapor pressure of Benzene is reduced from 104 torr to 102 torr. Calculate the molecular weight of the unknown. M = 102.00 g/mol Henry’s Law: C = kP Raoult’s Law: P solvent = P° solvent • χ solvent Boiling Point Elevation: Δ T B = k B m Freezing Point Depression: Δ T F = k F m Osmotic Pressure: Π = MRT R = 0.0821 L•atm/mol•K 1 atm = 760 torr [ C ] c [ D ] d = aA + bB cC + dD K eq [ A ] a [ B ] b K p = K c (RT) Δ n − b ± b 2 − 4ac ay 2 + by + c = 0 y = 2a...
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