Practice Problem Set 1 2.12.12

Practice Problem Set 1 2.12.12 - Susie Lee...

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Susie Lee Practice Problem Set 1 SI sessions Susie.lee714@hotmail.com Sun 7-8p HECC 202 2/12/12 Mon 7-8p HECC 202 Wed 7-8p HECC 202 1.) The vapor pressure of pure water at 25 o C is 23.8torr. Determine the vapor pressure (in torr) of water at 25 o C above a solution prepared by dissolving 35g of urea (a nonvolatile, non-electrolyte, MW = 60.0g/mol) in 75g of water. 2.) A solution containing 10.0g of an unknown liquid and 90.0g water has a freezing point of -2.99 o C. Given K f = -1.86 o C/m for water, calculate the molar mass of the unknown liquid. 3.) Which of the following aqueous solutions has the highest osmotic pressure? a.) 0.15M KCl c.) 0.10 M Sr(NO 3 ) 2 b.) 0.20M C 12 H 22 O 11 d.) 0.20 M NH 4 NO 3 4.) The reaction below has a rate constant of 7.93 x 10 -3 M -1 s -1 at a temperature of 501K. How long does it take for the concentration of N 2 O 5 to drop from 0.260 M to 0.100M? 2N 2 O 5 (g) 4NO 2 (g) + O 2 (g) 5.) The isomerization of methylisonitrile to acetonitrile is a first order reaction. What is the half life of this reaction if k = 9.45 x 10 -5 s -1 ?
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Practice Problem Set 1 2.12.12 - Susie Lee...

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