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[Exam Tutorial] CHMA11 2011 Midterm Questions
[Exam Tutorial] CHMA11 2011 Midterm Questions

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University of Toronto Scarborough

Multiple choice. Choose the one alternative that best completes the statement or answers the question. 1) When a liquid is in equilibrium with its vapor in a closed container: a) The rate at which molecules from the liquid phase enter the gas phase exactly equals the rate at which molecules from the gas phase pass into the liquid phase b) The amount of gas in the container must exactly equal the amount of liquid c) The vapor will gradually change back to the liquid state, that is, no vapor will be left. d) A change in temperature will not change the pressure in the container e) Molecules cannot go from the liquid phase to the gas phase because the amount of liquid in the container is constant. o 2) A liquid has an normal boiling point of 78 C and its vapor pressure is 400 mmHg at 50 C. To compute the molar heat of vaporization, one needs: a) The mole weight b) The specific heat c) The vapor pressure at another temperature d) Nothing , enough information is given e) None of these 3) The relationship between the vapor pressure of a liquid and temperature can be expressed by the Clausius-Clapeyron Equation: ∆ Ln[P 2P ]1= [ H vap x[1/T -11T ] 2 o ∆ Ethanol (C H2O5) has a normal boiling point of 78.3 C and H vap.3 kJ/mol. What o is the vapor pressure of ethanol at 50.0 C? Note that 1 atm = 760 torr. a) 234 torr B) 670 torr c) 118 torr D)354 torr e)485 torr 4) A substance has a heat of fusion of 61.5 kJ/mol and a heat of deposition of -167.4 kJ/mol. What is the heat of sublimation in kJ/mol? a) -61.5 b) -105.9 c) 228.9 D)167.4 e) 105.9 5) Arrange the following compounds in order of increasing boiling point: I 1-propanol, (structure CH Ch Ch OH); II 1,2-propanediol, (CH CH(OH)CH OH); III 1,2,3- 3 2 2 3 2 propanetriol, (glycerol, with structure HOCH CH(2H)CH OH) 2 a) III,II,I b) II,III,I c) I,III,II d) I,II,III E) III, II, I 6) In a particular unit cell, all sides areequal in length and all angles are right angles. There is an atom at each corner and one at the center of each side. Which statement is true? a) This is a body-Centered cubic cell containing 4 atoms b) This is an fcc with 2 atoms per unit cell c) This is a simple cubic cell d) This has 4 atoms per unit cell e) None of these 7) A solution prepared by dissolving 4.00g KCl in 36.0g H O is said to be: 2 a) 0.100% KCl by mass b) 0.111% KCl by mass c) 11.1% KCl by mass d) 9.00% KCl by mass e) 10..0% KCl by mass 8)A 1.00 molal solution of NaCl in water contains: a) 1.00 mol NaCl per 1000.0 mL solution b)1.00 mol NaCl per 1000.0 g H O 2 c) 1.00 mol NaCl per 1000.0 kg H O 2 d) 1.00 g NaCl per 1000.0 g H O 2 e) 1000.0 g NaCl per 1000.0g H O 2 9) Which of the following organix substances is most soluable in water? a) Toluene b) Benzene c) Octane d) Pyridine e) Carbon tetrachloride 10) A handbook gives the aqueous solubility of carbon monoxide at 0 C and 1 atm CO pressure to be 0.0354 mg C per mL of solution. What would be the molarity of CO in water if the partial pressure of CO is 0.00036 atm. -7 A) 4.5 X 10 M B) 3.2 X 10 M-3 -3 C) 1.3 X 10 M -4 d) 2.9 x 10 M e) 1.3 x 10 M5 11) The vapor pressures of pure propyl alcohol and isopropyl alcohol are 21.0 mmHg and 45.2 mmHg, respectively, at 25 C. What is the composition of the vapor in equilibrium with a propyl o alcohol isopropyl alcohol solution at 25 C in which the mole raction of propyl alcohol, x prop is 0.250? a) xiso.317, x = pop83 B) X iso= 0.750, X prop 0.250 C) X iso.512, X = 0pop8 C)X =iso866, X prop 0.134 12) Solutions are made that contain 0.10 moles of each of the following compounds in 100g of H 2. Choose the compound whose solution will have the highest freezing point. a) Ca (P3 ) 4 2 b) Mg(CH CO )3 2 2 c) NaI d) K S2 4 e) Sr(NO ) 3 2 13) Exactly 375.0 mg of an unknown protein is dissolved in enough water to give 50m00 mL of
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