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Homework 3 Sutcliffe

# Homework 3 Sutcliffe - huynh(hph268 Homework 3...

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huynh (hph268) – Homework 3 – Sutcliffe – (51060) 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This is the remainder of the material for Exam 1. 001 10.0 points Find the normal boiling point of 4 m CaCl 2 (aq), assuming it undergoes complete dissociation. The boiling point constant of water is 0 . 51 K · kg / mol. Answer in units of C. Your answer must be within ± 0.3% 002 10.0 points Glycerol (a non-electrolyte that can be used as antifreeze in a car radiator) has a density of 1.261 g/mL and a molecular weight of 92 g. If 100 mL are mixed with 1 kg of water, what is a good estimate of the temperature at which this solution will freeze? ( K f water = 1 . 861 C/ m .) 1. 0.0 C 2. 12 . 4 C 3. 4 . 8 C 4. 0 . 23 C 5. 2 . 6 C 003 10.0 points Polyacrylamide is a water-soluble polymer whose aqueous solution containing 25 g/L de- velops an osmotic pressure of 0.54 torr at 25 C. Find the approximate molecular weight of the polymer sample. 1. 35,000 g/mol 2. 1133 g/mol 3. 8,600,000 g/mol 4. 860,000 g/mol 5. 350,000 g/mol 004 10.0 points Consider the solutions Z1) 0.5 M Na 2 SO 4 Z2) 0.6 M NaCl Z3) 1.0 M sugar What answer gives the expected order of increasing osmotic pressure? 1. lowest Z2 < Z1 < Z3 highest 2. lowest Z3 < Z1 < Z2 highest 3. lowest Z2 < Z3 < Z1 highest 4. lowest Z3 < Z2 < Z1 highest 5. lowest Z1 < Z2 < Z3 highest 005 10.0 points Two aqueous solutions are separated by a semipermeable membrane.

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Homework 3 Sutcliffe - huynh(hph268 Homework 3...

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