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# E1_S08 - Exam#1 Chemistry 112 Spring 2008 Name_Student ID...

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Exam #1 Chemistry 112 Spring 2008 Name: ___________________________Student ID:____________ Show your work!!!!!! Henry’s Law: C = k P Raoult’s Law: P solvent = P° solvent χ solvent Boiling Point Elevation: Δ T B = i•m•k B Freezing Point Depression: Δ T F =i•m•k F Osmotic Pressure: Π = i•M•R•T 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) Δ n ay 2 + by + c = 0 y = b ± b 2 4ac 2a

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1 (20 points). A 10.0 % solution of sugar (C 12 H 22 O 12 ) in water (H 2 O) has a density of 1.04 g/mL. Express this concentration as a) molality (m) b) molarity (M)
2 (20 points). The vapor pressure of trichloroethane (C 2 H 3 Cl 3 ) is 100 torr at 20 °C. What is a vapor pressure of trichloroethane at 20 °C above a solution containing 2.00 g of ferrocene (Fe(C 5 H 5 ) 2 ) in 25 g of trichloroethane? Ferrocene is a non-electrolyte.

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3 (15 points). K c at 970 K is 0.38 M for: CaCO 3 (s) CO 2 (g) +CaO(s) a. Write expression for K c b. Calculate K c at 970 K for CO 2 (g) +CaO(s) CaCO 3 (s) c. Calculate K p at 970 K for CO 2 (g) +CaO(s) CaCO 3 (s)
4 (15 points). The equilibrium constant, K c , for the following reaction is 9.52x10

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