Assignment 10 - Girish Toofany Chem121/120 2008-3 Surrey Le...

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Girish Toofany - Chem121/120 2008-3 Surrey Le 1 Assignment 10. Due date: Sat Nov 29 23:59:00 2008 3 point(s) DiFerent Ways of Expressing Concentration An aqueous antifreeze solution is 42.0% ethylene glycol (C 2 H 6 O 2 ) by mass. The density of the solution is 1.054 g/cm 3 . Calculate the molality of the ethylene glycol. m You are correct. Your receipt is 167-1044 Calculate the molarity of the ethylene glycol. M You are correct. Your receipt is 167-6227 Calculate the mole fraction of ethylene glycol. You are correct. Your receipt is 167-7381 1 point(s) Qualitative Solubility Predictions Which solvent would be a better choice to dissolve each of the following? Choices: carbon tetrachloride , water . A. Ascorbic acid (vitamin C) O OH HO O OH HO B. CHCl 3 C. (NH 4 )(CH 3 CO 2 ) D. H 2 S E. C 2 H 6 F. CH 3 CO 2 H You are correct. Your receipt is 167-9260 1 point(s) Henry’s Law Air contains 78 % N 2 and 21 % O 2 (mole percentages). Predict the equilibrium molar ratio of nitrogen to oxygen ([N 2 ]/[O 2 ]) dissolved in water which is exposed to air at 298 K. N 2(g) over water: k H = 8 . 57 × 10 4 atm O 2(g) over water: k H = 4 . 34 × 10 4 atm (Assume ideal gas behaviour.) cf Zumdahl "Chemical Principles" 6th ed. pp 855- 856. You are correct. Your receipt is 167-1606 1 point(s) Vapour Pressure of a Solution of a Non-Volatile So- lute. A solution is made by dissolving 40.0g of urea (H 2 NCONH 2 , a non-volatile non-electrolyte) in 284g of water. Calculate the vapour pressure of this solution at 35
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This note was uploaded on 06/27/2009 for the course CHEM CHEM 121 taught by Professor Peggy during the Spring '09 term at Simon Fraser.

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Assignment 10 - Girish Toofany Chem121/120 2008-3 Surrey Le...

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