12 14 2016 RWW05 Colligative Properties Paddy Sheehan CH 201 section 002 Fall 2016 Instructor Robert Warren WebAssign RWW05 Colligative Properties Homework Current Score 105 105 Due Tuesday September 13 2016 11 59 PM EDT The due date for this assignment is past Your work can be viewed below but no changes can be made Important Before you view the answer key decide whether or not you plan to request an extension Your Instructor may not grant you an extension if you have viewed the answer key Automatic extensions are not granted if you have viewed the answer key View Key 1 52 52 points Previous Answers The molality of an aqueous solution of a nonelectrolyte is 1 260 m For pure water at 20 oC Po 17 5 torr kf 1 86 oC m kb 0 563 oC m a What is the vapor pressure of the solution at 20 0 oC P 17 11 torr b What is the boiling point of the solution to the nearest 0 1 oC oC t 100 7 c What is the freezing point of the solution to the nearest 0 1 oC t 2 3 oC d Assume that the molality and molarity of the solution are equal to estimate the osmotic pressure that is developed by the solution at 20 0 oC P 30 30 atm 2 13 13 points Previous Answers A 3 14 g sample of an enzyme is used to make a 3 40 mL solution What is the molar mass of the enzyme if the osmotic pressure of the solution at 298K is 0 292 atm Note that enzymes are nonelectrolytes Mm 77379 7462 g mol http www webassign net web Student Assignment Responses last dep 14314086 1 2 12 14 2016 RWW05 Colligative Properties 3 13 13 points Previous Answers A solution is prepared by dissolving 3 37 g of an unknown nonelectrolyte in 21 00 g of cylcohexane tf 6 6 oC and kf 20 0 oC m What is the molar mass of the unknown compound if the solution has a freezing point of 6 1 oC Mm 252 718 g mol 4 13 13 points Previous Answers What is the osmotic pressure developed at 30 oC by an aqueous solution that is 0 214 M in AlCl3 21 29 atm 5 14 14 points Previous Answers HX is a weak acid that partially dissociates in water HX H1 X1 A 0 387 m aqueous solution of HX has a freezing point of 1 11 oC Express your answers to the following to three significant figures a What is the van t Hoff factor for HX in water i 1 5421 b EXTRA CREDIT What is the molality of X1 ions in the solution m 2097 http www webassign net web Student Assignment Responses last dep 14314086 2 2
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