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WORKSHEET 6: CHAPTER 17
1.
Water (H2O), acetone ((H3C)2CO), and heptane (C7H16) are combined in a
beaker. How many layers would you expect? If the density of water is
1 g/mL, acetone is 0.793 g/mL and heptane is 0.684 g/mL, which layer
would you expect to be on top?
2.
When boiling pasta, it’s common to add salt (NaCl – 58.44 g/mol) to the
water. Does this raise or lower the boiling point?
If you were to add 45.0 g NaCl to 1.5 L H2O (density = 0.994 g/mL, Kb =
0.51 ˚C kg/mol), what would you predict the magnitude of ∆Tboiling to be?
Assume complete dissociation of NaCl.
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3.
5.________________
If glycol, C2H4(OH)2, and methyl alcohol, CH3OH, are sold at the same
price per kilogram, which would be cheaper for preparing an antifreeze
solution for the radiator of a car?
Circle the cheaper solute:
C2H4(OH)2
CH3OH
Explain (in words or with calculations):
4.
At 19 ˚C, pure ethanol (C2H5OH) has a vapor pressure of 40.0 mmHg, and
pure benzene (C6H6) has a vapor pressure of 70.0 mmHg. A solution is
made with Xethanol = 0.3973.
What is the expected vapor pressure (mmHg) of this solution at 19 ˚C?