Question

7) List the following given compounds (using their numbers) from lowest to highest normal freezing point. Note: “(aq)” means the substance is dissolved in water.

Ne         H₂O      CHCl₃       1 m CaBr₂(aq) C₂H₅OH      1m Fe(NO₃)₃ (aq)     Cl₂

1              2             3                    4                       5                     6                       7   

    

lowest (number)                                                                                                     highest

___      ___     ___      ___       ___     ___     ___

8. At 25.0 ^oC. how many grams of sucrose (C₁₂H₂₂O₁₁, MM = 342.30 g/mol) must be added to 2.035 moles of water to achieve a solution vapor pressure of 18.500 torr? The vapor pressure of pure H₂O = 23.822 torr at 25.0 ^oC.

a) 57.25            b) 28.87            c) 516.3           d) 285.3           e) 452.2        f) 200.4          

9) At 25.0 ^oC, the density of an aqueous 5.827 M H₂SO₄ (MM = 98.079 g/mol) solution is 1.329 g/cm³. What is the molality (m) of the solution?

a) 8.660           b) 2.835           c) 6.393           d) 10.44           e) 7.692             f) 2.294

10) What is the Molarity of the iodide ions in an aqueous 0.695 m iron(III) iodide solution at 20.0 ^oC, whose density at that temperature is 1.198 g/mL?

a) 0.6328              b) 2.882                c) 1.916                d) 0.5672                 e) 0.8971