T 16% 12:15 AM oo AT&T; sacct.csus.edu CSUS Department of Chemistry Experiment 1

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T 16% 12:15 AM oo AT&T; sacct.csus.edu CSUS Department of Chemistry Experiment 10 Chem. 1A EXPERIMENT 10: PRE-LABORATORY Name: ASSIGNMENT 10 Section: Score: 1. Ideally, colligative properties depend only on th e? 2. If 86.5 g of ethanol (C is added to 355 g of water, what is the molality of the ethanol solution? Ans 3. Which of the following aqueous solutions should have the lowest freezing point? a. pure H20 b. 1 m MgBr. c. 1 m Rbl d. 1 m NH e. 1 m CH3OH Why? 4. What is the freezing point of a solution containing 3.10 grams benzene (molar mass 78.11 g/mol) dissolved in 32.0 grams paradichlorobenzene? The freezing point of pure paradichlorobenzene is 53.0 oC and the freezing point depression constant, K is -7.10 oC/m. Ans 5. What is the molar mass of an unknown molecular compound if 3.42 grams dissolved in 41.8 grams benzene begins to freeze at 1.17 C? The freezing point of pure benzene is 5.50 CC and the freezing point depression constant, K s-5.12 C/m. Ans rev: F14. Page 1 of 7

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