Which of the following statements is TRUE? In general, the solubility of a solid

ID: 817463 • Letter: W

Question

Which of the following statements is TRUE?

           In general, the solubility of a solid in water decreases with increasing temperature.
           In general, the solubility of a gas in water decreases with increasing temperature.
           The solubility of a gas in water usually increases with decreasing pressure.
           The solubility of an ionic solid in water decreases with increasing temperature.
           None of these statements are true

Question 7

              Which of the following compounds will be most soluble in nonane (C9H20)?
           pentanol (CH3CH2CH2CH2CH2OH)
           benzene (C6H6)
           acetic acid (CH3CO2H)
           ethyl methyl ketone (CH3CH2COH3)
           None of these compounds should be soluble in pentan

Question 8

              Which physical property is not true regarding solutions of nonvolatile solutes.
           Vapor pressure of the solution is lower.
           Boiling point of solution is lower than that of solvent.
           Melting point of solution is lower than that of solvent.
           Osmotic pressure is produced by solvent in the more dilute solution toward the more concentrated solution.
           All of these are correct

Question 9

   Dynamic equilibrium can be defined as
           rate of dissolution = rate of deposition
           rate of dissolution < rate of deposition
           rate of dissolution > rate of deposition
           rate of bubbling > rate of dissolving
           rate of condensing > rate of bubbling

Question 10

              The vapor pressure of pure benzene () and toluene () at 25C are 95.1 and respectively. A solution is prepared with a mole fraction of toluene of 0.750. Assume the solution to be ideal and determine the total vapor pressure above the solution, in
           61.8
           66.7
           123.5
           45.1
           78.4

Question 11

              The normal freezing point of cyclohexane is 6.55C. When 0.458 g of an unknown solute is dissolved in 15.0 g of cyclohexane, the freezing point is found to be 3.19C. What is the experimental molar mass of the unknown solute?
           160
           182
           360
           89.3
           18.0

Question 12

              An aqueous solution is prepared by dissolving 2.05 g of hemoglobin in 100.0 mL of solution. The solution has an osmotic pressure of 5.69 mmHg at 298K. What is the molar mass of hemoglobin?
           6.7 x
           3.3 x
           3.3 x
           3.8 x
           5.6 x

Question 13

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a melting point of 5.50 Which of the following statements is TRUE?

Explanation / Answer

6.a

7.c

8.a

9.d

10.a

11.b

12.a

13.c

14.a

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