Answered: + H H3C 'N´ -R =C H H.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

The generic structural formula for a 1-alkyl-3-methylimidazolium
cation is where R is a ¬CH21CH22nCH3 alkyl group. The melting
points of the salts that form between the 1-alkyl-
3-methylimidazolium cation and the PF6
- anion are
as follows: R = CH2CH3 1m.p. = 60 °C2, R = CH2CH2CH3
1m.p. = 40 °C2, R = CH2CH2CH2CH3 1m.p. = 10 °C2, and
R = CH2CH2CH2CH2CH2CH3 1m.p. = -61 °C2. Why does
the melting point decrease as the length of alkyl group
increases?

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