Chem 126 - Online HW 4

Chem 126 - Online HW 4 - Question 1 (Name:Arshi Imtiaz) A...

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Question 1 (Name:Arshi Imtiaz) A solution is prepared by dissolving 0.151 mol of calcium chloride in 479 g of water, what is the mass percentage of calcium chloride in the solution? 2.86 % 4.84 % 4.10 % 2.30 % 4.49 % 3.38 % Question 2 (Name:Arshi Imtiaz) Calculate the mole fraction of ethanol, CH 3 CH 2 OH, in a solution that contains 5.50 g of ethanol dissolved in 37.8 g of water. 4.58 x 10 -2 4.86 x 10 -2 5.04 x 10 -2 4.62 x 10 -2 5.38 x 10 -2 4.93 x 10 Question 3 (Name:Arshi Imtiaz) How many grams of sodium bromide must be added to 499 grams of water in order to prepare a 1.20 molal sodium bromide solution? 59.1 g 42.8 g 61.6 g 59.2 g 65.6 g 5.82 x 10 -3 g 0.599 g Question 4 (Name:Arshi Imtiaz) 23.9 grams of sodium sulfate is mixed with 423 grams of water. What is the molality of the sodium sulfate solution? 0.375 m 8.03 x 10 -3 m 0.411 m 5.65 x 10 -2 m 56.5 m 0.427 m 0.398 m
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Question 5 (Name:Arshi Imtiaz) A an aqueous methanol (CH 3 OH) solution has a mole fraction of 0.389 of methanol. What mass of water would be present in 893 g of this solution? 419 g 380. g 457 g 359 g 474 g 385 g Question 6 (Name:Arshi Imtiaz) An aqueous solution is 0.151 mole fraction copper (II) nitrate. What is the molality of the copper (II) nitrate solution? 8.84 m Cu(NO 3 ) 2 10.2 m Cu(NO 3 ) 2 9.88 m Cu(NO 3 ) 2 11.2 m Cu(NO 3 ) 2 9.00 m Cu(NO 3 ) 2 10.4 m Cu(NO 3 ) 2 Question 7 (Name:Arshi Imtiaz) The vapor pressure of water is 74.8 mm Hg at a certain temperature. A solution is prepared by dissolving 5.57 grams of glycerol, C 3 H 8 O 3 , in 44.0 grams of water. What is the vapor pressure, in mm Hg of water over the solution at this temperature? Note that glycerol does not undergo ionization in solution and does not have a significant vapor
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This note was uploaded on 04/09/2008 for the course CHEM 126 taught by Professor Bussell during the Winter '07 term at Western Washington.

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Chem 126 - Online HW 4 - Question 1 (Name:Arshi Imtiaz) A...

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