CHEM 2200 1nd Edition Lecture 8 Outline of Last Lecture I Concentration II Collision Theory III The Arrhenius Equation IV Effects of Catalysts on Reaction Rates Outline of Current Lecture I In Class Questions Current Lecture 1 Which of these solutions will have the highest boiling point a 0 35 m Ethylene Glycol b 0 20 m KBr c 0 50 m Glucose d 0 20 m Na2SO4 2 a 0 0200 m aqueous solution of an ionic compound Co NH 3 4Cl3 freezes at 064 C Kp for water is 1 86 a Calculate the molality from the freezing point depression value i Tf 0 0640 ii m Tf Kfp m 3 44 x 10 2 m 0 0344 m effective molality Stated molality is 0 0200 m b What is the van t Hoff factor for this compound i i meffective mstated 0 0344 0 0200 1 72 m 3 A 0 100 M acetic acid solution has an osmotic pressure of 2 47 atm at 25 C What is the percent ionization of acetic acid in the solution a What is percent ionization i Ratio of of ions ionized total of ions These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ii 0 100 M is the denominator b Using R 0 08206 L atm mol K what is the effective molarity of the solution i MRT M RT 2 47atm 0 08206 L atm mol K 298 K 0 101 M effective molarity c Build ICF chart d Meffective 0 100 x x x 0 100 x total concentration in solution x 0 001 M Percent ionization 0 001 M 0 100 M 0 01 x 100 1 weak electrolyte 4 The smell of ripe raspberries is due to 4C5H6O To find its molecular formula you dissolve 0 135 g in 25 0g of chloroform CHCl3 The boiling point of the solution is 61 82 C What is the molecular formula of the solute a CHCl3 BP 61 70 C Kbp 3 63 C m Answer C10H12O2
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