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Self Assessment A
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1

Which of the following compounds would be most likely to dissolve in CCl4?
A)I2 .
B)H2O
C)C8H18
D)Compounds A and C
E)Compounds B and C
2

The most significant forces between solute and solvent in an aqueous ethyl alcohol (CH3CH2OH) solution are
A)charge-charge interactions.
B)charge-dipole interactions
C)dispersion forces
D)hydrogen bonding
3

What is the molality of a solution composed of 38.0 g of cane sugar (C12H 22O11) dissolved in 175 g of water?
A)0.514 mol/kg
B)635.0 mol/kg
C)0.217 mol/kg
D)0.635 mol/kg
E)217 mol/kg
4

A sample of rubbing alcohol contains 142.0 g of isopropanol (C3 H7OH) and 58.0 g of water. The mole fractions of alcohol and water are
A)2.36 and 3.22
B)0.423 and 0.577
C)0.236 and 0.322
D)0.577 and 0.423
E)0.733 and 1.324
5

The solubility of a gas in water generally ________ with increasing pressure.
A)increases
B)decreases
C)remains the same
D)In order to answer the question, one must know the identity of the gas in question.
6

The vapor pressure of pure water at 26 oC is 25.21 torr. What is the vapor pressure of a solution that contains 16.0 g of glucose (C6H12O6) dissolved in 80 g of water?
A)16.8 torr
B)24.7 torr
C)0.49 torr
D)25.4 torr
E)14.1 torr
7

Calculate the approximate freezing point of a solution prepared by dissolving 10.0 g of naphthalene (C10H8) in 300 g of cyclohexane. Pure cyclohexane freezes at 6.6 oC. Kf of cyclohexane = 20.0 oC/m.
A)5.21
B)-1.4
C)11.8
D)1.4
E)None of the above
8

What would be the osmotic pressure at 65.0 oC of an aqueous solution containing 2.50 g of sucrose (C12H22O11) per 205 mL of solution?
A)0.989 atm
B)0.192 atm
C)0.812 atm
D)0.338 atm
E)1.450 atm
9

The freezing point of a solution prepared by dissolving 17.0 g of KCl in 150 g of water is -4.70 oC. Calculate the van't Hoff factor, i, for this solution. Kf for water = 1.86 oC/m.
A)1.86
B)2.52
C)1.66
D)1.52
E)None of the above





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