Solubility Worksheet With Answers Page 6
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833) The freezing point of ethanol (C 2 H 5 OH) is -114.6 °C. The molal freezing point depression constant
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for ethanol is 2.00 °C/m. What is the freezing point (°C) of a solution prepared by dissolving 50.0 g
of glycerin (C 3 H 8 O 3 , a nonelectrolyte) in 200 g of ethanol?
A) -114.6
B) -115
C) -120.0
D) -132.3
E) -5.42
34) What is the freezing point (°C) of a solution prepared by dissolving 11.3 g of Ca(NO 3 ) 2
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(formula weight = 164 g/mol) in 115 g of water? The molal freezing point depression constant for
water is 1.86 °C/m.
A) -3.34
B) -1.11
C) 3.34
D) 1.11
E) 0.00
35) A solution containing 10.0 g of an unknown liquid and 90.0 g water has a freezing point of -3.33 °C.
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Given K f = 1.86 °C/m for water, the molar mass of the unknown liquid is __________ g/mol.
A) 619
B) 333
C) 69.0
D) 62.1
E) 161
36) A solution is prepared by dissolving 0.60 g of nicotine (a nonelectrolyte) in water to make 12 mL of
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solution. The osmotic pressure of the solution is 7.55 atm at 25 °C. The molecular weight of nicotine
is __________ g/mol.
A) 160
B) 28
C) 43
D) 50
E) 0.60
37) A solution is prepared by dissolving 6.00 g of an unknown nonelectrolyte in enough water to make
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1.00 L of solution. The osmotic pressure of this solution is 0.750 atm at 25.0 °C. What is the
molecular weight (g/mol) of the unknown solute?
A) 30.6
B) 195
C) 16.4
D) 110
E) 5.12 × 10 -3
38) Calculate the freezing point (0°C) of a 0.05500 m aqueous solution of glucose. The molal
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freezing-point-depression constant of water is 1.86 °C/m.
A) -0.2046
B) 0.0286
C) -0.1023
D) 0.1023
E) -0.05627
39) Calculate the freezing point (0°C) of a 0.05500 m aqueous solution of NaNO 3 . The molal
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freezing-point-depression constant of water is 1.86 °C/m.
A) -0.2046
B) 0.0286
C) 0.1023
D) -0.1023
E) -0.05627
40) An aqueous solution of a soluble compound (a nonelectrolyte) is prepared by dissolving 33.2 g of
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the compound in sufficient water to form 250 mL of solution. The solution has an osmotic pressure
of 1.2 atm at 25 °C. What is the molar mass (g/mL) of the compound?
A) 2.3 × 10 2
B) 1.0 × 10 3
C) 6.8 × 10 2
D) 2.7 × 10 3
E) 28
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