Exam 3 (2)

Question 1

Determine the [OH  ] concentration in a 0.169 M Ca(OH) 2 solution.          

1.   0.169 M
2. 0.338 M
3. 0.298 M
4. 5.92 × 10-14 M
5.   2.96 × 10-14 M

Question 2

Determine the vapor pressure (in torr) of a substance at 36°C, whose normal boiling point is 84°C and has a ΔH vap of 22.1 kJ/mol.            

1. 31.8 torr
2. 239 torr
3. 41.8 torr
4. 147 torr
5. 98 torr

Question 3

Identify the type of solid for diamond.          

1.   metallic atomic solid
2. networking atomic solid
3. nonbonding atomic solid
4. ionic solid
5. molecular solid

Question 4

Identify the type of solid for gold.            

1. ionic solid
2. nonbonding atomic solid
3. molecular solid
4. networking atomic solid
5. metallic atomic solid

Question 5

At 20°C, an aqueous solution that is 24.0% by mass in ammonium chloride has a density of    What is the molarity of ammonium chloride in the solution? The formula weight of NH 4Cl is          

1. 0.479
2. 5.90
3. 4.79
4. 0.0445
5. 22.5

Question 6

The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin    in 0.250 L of water at 25°C is ________ atm.      

1.   13.6
2.  1.14 × 10-3
3.  2.45
4. 1.38
5. 0.0136

Question 7

To make a 0.500 M solution, one could take 0.500 moles of solute and add            

1. enough solvent to make 1.00 L of solution.
2. 1.00 kg of solvent.
3. 1.00 L of solvent.
4. enough solvent to make 1.00 kg of solution.

Question 8 

Calculate the freezing point of a solution of 40.0 g methyl salicylate, C 7H 6O 2, dissolved in 800. g of benzene, C 6H 6.    and the freezing point is 5.50°C for benzene.    

1. 7.59°C
2.  2.09°C
3.   -2.09°C
4.     3.41°C