3F. 19

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Kelly Cai 4D
Posts: 55
Joined: Sat Jul 20, 2019 12:17 am

3F. 19

Postby Kelly Cai 4D » Sun Nov 10, 2019 11:48 am

Account for the following observations in terms of the type and strength of intermolecular forces. (a) The melting point of solid xenon is 2112 8C and that of solid argon is 2189 8C. (b) The vapor pressure of diethyl ether (C2H5OC2H5) is greater than that of water. (c) The boiling point of pentane, CH3(CH2)3CH3, is 36.1 8C, whereas that of 2,2-dimethylpropane (also known as neopentane), C(CH3)4, is 9.5 8C.

Ramneet Sandhu 3D
Posts: 50
Joined: Fri Aug 30, 2019 12:16 am

Re: 3F. 19

Postby Ramneet Sandhu 3D » Sun Nov 10, 2019 1:01 pm

(a) xenon is able to support larger dipole moments than argon; it is also larger so it is more polarizable, and London interactions are larger as well
(b) diethyl ether molecules have larger London interactions than water molecules, and have weaker dipole-dipole forces; water has strong hydrogen bonds, so water has lower pressure
(c) both have same molecular weight and are non-polar; London interactions are present; pentane has larger surface for interactions so it will be larger than neopentane


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