chem162_ex2_packet_key

# 5 175 g of polyvinyl acetate lw 150000 was dissolved

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5 ) 17.5 g of polyvinyl acetate @lW 150,000) was dissolved in 100 mL of glacial acetic acid @.p. 117.9"C; density, .d = 1.0492 glmL). Calculate the boiling point of the solution (find K, in the textbook). 4 b -d. ..I - - - -003x6 "c 6. (6 points) Which of the following aqueous solutions will develop the greatest osmotic pressure? '&= ib4C-q- , a d s * I (a) 0.045 mol L-' sucrose (molar mass 342 glmol) &= - . OLT * \ (b) 0.055 mol L-' polyvinyl alcohol (molar mass 150 000 g/rnol) ' I ;ow t= 3 (c) 0.035 mol L-' CaC1, c = 3 *02s @ 0.025 rnol L-I Al,(SO,), -(,= 5

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10. (10 points) Your car radiator overheats and the-coolant is boiling at 115°C. Assuming pure water as the coolant in a closed system, use the enclosed graph to estimate the pressure in the radiator. Is the situation safe, provided your radiator is rated to withstand 2.5 atm pressure?
1. (6 points) What is the number of nearest neighbors for metal atoms in: (a) hexagonal close-packed structure (b) cubic close-packed structure (c) body-centered cubic structure 4 6) 10 12 16 2. Four different solutions (a) - (d)were prepared by dissolving in 333 mL of water 2.3 g of either I ATeyv\. O C M 0 ~ - (a) sucrose (molar mass 342 glmol) MVJ (b) fructose (molar mass 180 glmol) (c) urea (molar mass 60 glmol) +- k s b Lr (d) polyacrylic arnide (molar mass 10' glmol). -c- && I?r Which of the solut.ions has the lowest and which the highest boiling point? .. . The freezing point of a solution can be calculated if you know: (circle one answer, (a) . solute melting points (b) both solute dipole moments and molar concentrations (c) solute dipole moments (d) solute molar concentrations solute molalities and the freezing point of the solvent (f) your TA's phone number (g) none of these

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1) A desalination plant uses reverse osmosis to purify seawater of the following ion concentrations (g/L): C1- 19.0, Na' 10.5, Mg2+ 1.35, SO:- 0.885, Ca2+, 0.4,'~' 0.38, B r 0.065. What is the minimum operation pressure in the seawater compartment at which reverse osmosis occars? 2) What amount of sulfur trioxide was dissolved. in 1L of water that caused the 3) What is the boiling point of seawater from 1) (assume seawater density = 1.000
2) Why is the ABCABC.. .. closest packing called cubic. ? 4) What is common in the following reactions: (a) Dimerization of MCI, to W L ; @) Dissolution of M(OH), in concentrated aqueous sodium hydroxide to form the Al(0H); ion; (c) Formation of the BF,. .MH, complex?

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• Spring '08
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