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<div class="moz-cite-prefix">I knew that this was an "i" type
problem because it gave me all of the other freezing point "stuff"
but also asked for what fraction was associated as dimers. <br>
<br>
Now remember, the "i" is telling us basically how many components
of the solute are impacting the colligative property. If the
bromoform did not associate into dimers then the value of "i"
would be one. If the bromoform somehow broke into multiple
pieces then the value of "i" would be greater than one. The
problem tells us that SOME of the bromoform will form dimers. In
other words, in solution we have some bromoform that does this...<br>
<br>
<img style="vertical-align: middle"
src="cid:part1.04010900.03090009@mercer.edu"
title="\documentclass{article}
\usepackage[utf8x]{inputenc}
\pagestyle{empty}
\usepackage{mhchem}
\begin{document}
\ce{CHBr3 + CHBr3 -> (CHBr3)2}
\end{document}
" alt="\documentclass{article}
\usepackage[utf8x]{inputenc}
\pagestyle{empty}
\usepackage{mhchem}
\begin{document}
\ce{CHBr3 + CHBr3 -> (CHBr3)2}
\end{document}
"><br>
<br>
So if the number of DIMERS formed is <img style="vertical-align:
middle" src="cid:part2.08000108.07070005@mercer.edu" alt="$x$">
then the number of molecules that are left undimerized is <img
style="vertical-align: middle"
src="cid:part3.09090707.03090400@mercer.edu" alt="$(1-2x)$">.
It is the sum of the undimerized and dimerized molecules that is
equal to the value of "i" in the case.<br>
<br>
<img style="vertical-align: middle"
src="cid:part4.00040101.09060601@mercer.edu" alt="$i = 0.6134 =
(1-2x)+x$"><br>
<br>
so <img style="vertical-align: middle"
src="cid:part5.05090807.01060701@mercer.edu" alt="$x=0.3866$">
(which is the fraction that are dimers). Twice of this number
would then be the number of molecules that formed dimers. That is
0.7732, or 77.32%.<br>
<br>
<br>
<br>
<br>
On 02/23/14 09:41, wrote:<br>
</div>
<blockquote
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<p> </p>
<p>Hello Dr. Pounds,</p>
<p> </p>
<p>Could you explain how you did number 8 in additional problems
for chapter 13? Also, how did you know to solve for 'i' in
this problem?</p>
<p> </p>
<p>Thanks,</p>
<p><br>
</p>
</div>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Andrew J. Pounds, Ph.D. (<a class="moz-txt-link-abbreviated" href="mailto:pounds_aj@mercer.edu">pounds_aj@mercer.edu</a>)
Professor of Chemistry and Computer Science
Mercer University, Macon, GA 31207 (478) 301-5627
<a class="moz-txt-link-freetext" href="http://faculty.mercer.edu/pounds_aj">http://faculty.mercer.edu/pounds_aj</a>
</pre>
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