oT-Mobile LTE 12:08 AM e bbhosted.cuny.edu Homework Assignment #6 (Due date: Apr
ID: 965110 • Letter: O
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oT-Mobile LTE 12:08 AM e bbhosted.cuny.edu Homework Assignment #6 (Due date: April 13th, 2016) 4596 e (1) Classify each of the following solutions as an electrolyte or a non electrolyte: (a) NaNO3 (b) C6H1206 (c) FeCI3 (d) HCI (e) Ethanol (CH3CH20H) (2) Calculate the composition of each of the following solutions in mass/mass %; (a) 21.0 g NaCl in 1.00 x 102 g solution (b) 21.0 g NaCl in 5.00 x 102 mL solution (d = 1.12 g/mL) (3) Which solution is more concentrated: a 0.04% (min) solution or a 50 ppm solution? (4) Calculate the number of g of solute that would be needed to make each of the following solutions: (e) 2.50 x 102 mL of 0.100 M NaBr b) 2.50 x 102 mL of 0.200 M KOH (5) It is desired to prepare 0.500 L of a 0.100 M solution of NaCI from a 1.00 M stock solution. How many mL of the stock solution must be taken for the dilution? (6) Calculate the osmotic pressure of 0.50 M sodium chloride at 25 oC. Lof Ca2: in a solution that is S.ox 7) Calculate the number of eq/L of Ca2+ in a solution that is 5.0 x 10-2 M in Ca2+.Explanation / Answer
2.
mass percentage of NaCl = 21 / (1*10^2)*100 = 21 %
mass of slution = 5 *10^2 * 1.12 = 560 g
mass percentage = 21 / 560 *100 = 3.75 %
6.
P = i *C * R * T
P = 2 * 0.5 * 0.083 * 298
P = 24.734 atm
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