Propane CH,CH,CH3 Dimethyl ether CH,ÓCH, MW = 46 amu Acetaldehyde CH,CHO MW = 44 amu u = 2.7 D bp = 294 K Acetonitrile CH;CN MW = 41 amu MW = 44 amu u = 0.1 D bp = 231 K µ = 1.3 D bp = 248 K µ = 3.9 D bp = 355 K Increasing polarity Increasing dipole-dipole interactions A Figure 11.8 Molecular weights, dipole moments, and boiling points of several simple organic substances.

Propane CH,CH,CH3 Dimethyl ether CH,ÓCH, MW = 46 amu Acetaldehyde CH,CHO MW = 44 amu u = 2.7 D bp = 294 K Acetonitrile CH;CN MW = 41 amu MW = 44 amu u = 0.1 D bp = 231 K µ = 1.3 D bp = 248 K µ = 3.9 D bp = 355 K Increasing polarity Increasing dipole-dipole interactions A Figure 11.8 Molecular weights, dipole moments, and boiling points of several simple organic substances.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter10: Fuels, Organic Chemicals, And Polymers

Section: Chapter Questions

Problem 119QRT

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Question

Moving from left to right, do the dispersion forces get stronger, get
weaker, or stay roughly the same in the molecules shown here?

Propane
CH,CH,CH3
Dimethyl ether
CH,ÓCH,
MW = 46 amu
Acetaldehyde
CH,CHO
MW = 44 amu
u = 2.7 D
bp = 294 K
Acetonitrile
CH;CN
MW = 41 amu
MW = 44 amu
u = 0.1 D
bp = 231 K
µ = 1.3 D
bp = 248 K
µ = 3.9 D
bp = 355 K
Increasing polarity
Increasing dipole-dipole interactions
A Figure 11.8 Molecular weights, dipole moments, and boiling points of several simple organic
substances.

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