Exam1_S2004 - Exam#1 Chemistry 112 Spring 2004 Name Social...

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1 Exam #1 Chemistry 112 Spring 2004 Name: __________________________________ Social Security Number: ___________________ Henry’s Law: C = kP Raoult’s Law: P solvent = P° solvent χ solvent Boiling Point Elevation: T B = k B m Freezing Point Depression: T F = k F m Osmotic Pressure: Π = MRT R = 0.0821 L•atm/mol•K 1 atm = 760 torr aA + bB cC + dD K eq = [ C ] c [ D ] d [ A ] a [ B ] b K p = K c (RT) n ay 2 + by + c = 0 y = b ± b 2 4ac 2a
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2 1. (10 points) Calculate the boiling point of the solution of 2.00 g of Al( NO 3 ) 3 in 50 ml of pure water. K b of water is 0.51 ºC kg/mol.
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3 2. (10 points) From the following substances: A: pure water B: solution of 0.01 mol of glucose in 500 ml of water C: solution of 0.01 mol of LiBr in 500 ml of water D: solution of 0.01 mol of CaCl 2 in 500 ml of water choose the one with the -highest freezing point -lowest freezing point -highest boiling point -lowest osmotic pressure
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4 3. (15 points) A forensic chemist is given a white solid that is suspected of being pure cocaine (C 17 H 21 NO 4 , molar mass = 303.35 g/mol, nonelectrolyte). She dissolves 1.22 g of it in 15.60 g of benzene. The freezing point is lowered by 1.32 ºC.
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