WA_2 solutions - WEBASSIGN #2 – Chapter 11 1. Arrange the...

WA_2 solutions
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WEBASSIGN #2 – Chapter 11 1. Arrange the following substances in the expected order of increasing boiling point: H 2 O, NH 3 , CH 4 , CH 3 CH 3 . (_) CH 4 < CH 3 CH 3 < H 2 O < NH 3 (o) CH 4 < CH 3 CH 3 < NH 3 < H 2 O (_) CH 3 CH 3 < CH 4 < NH 3 < H 2 O (_) H 2 O < NH 3 < CH 3 CH 3 < CH 4 Select the reasons for your ranking. (Select all that apply.) [x] NH 3 has a higher boiling point than NH 3 CH 3 . [x] In H 2 O, hydrogen bonding is still stronger. [_] H 2 O, hydrogen bonding is weaker. [_] CH 4 and CH 3 CH 3 are polar. 2. At its normal boiling point, the enthalpy of vaporization of chloroform, CHCl 3 , is 247 J/g. (a) How many grams of CHCl 3 can be vaporized with 5.53 kJ of heat? [22.4] g (b) What is H vap of CHCl 3 expressed in kilojoules per mole? [29.5] kJ/mol (c) How much heat, in kilojoules, is evolved when 28.3 g CHCl 3 ( g ) condenses? [6.99] kJ 3.
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How much heat, in kilojoules, is required to melt a cube of ice that measures 5.60 cm on an edge? The density of ice is 0.92 g/cm 3 and the enthalpy of fusion is 6.01 kJ/mol. [54] kJ 4. Which substance in each of the following pairs would you expect to have larger
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