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<div class="moz-cite-prefix">On 07/12/13 15:13, wrote:<br>
</div>
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<div style="direction: ltr;font-family: Tahoma;color:
#000000;font-size: 10pt;">Good Afternoon Dr. Pounds,
<div><span class="Apple-tab-span" style="white-space:pre"></span>I
have a question about #60 in the Chapter 15 problems. If we
were given an endothermic process I understand the opposite
will happen for part A,B, and C but what will happen for part
D and E?</div>
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</blockquote>
<br>
If this were an endothermic reaction, both of these changes would
still have "no effect".<br>
<br>
<blockquote
cite="mid:C40B2F181831EF44A88CD735258278030261C41C6C@MERCERMAIL.MercerU.local"
type="cite">
<div style="direction: ltr;font-family: Tahoma;color:
#000000;font-size: 10pt;">
<div><span class="Apple-tab-span" style="white-space:pre"></span>I
also have a question about #102 in the Chapter 15 problems.
How did you do the algebra to calculate the moles of nitrogen
dioxide and dinitrogen tetraoxide?</div>
<div style="text-align: right;">Thank you,</div>
<div style="text-align: right;">Yordanos Abitew</div>
</div>
</blockquote>
<br>
Because I knew the total mass and the total moles, but not the
individual number of moles, I set up two equations in two unknowns
(simultaneous equations from Algebra)<br>
<br>
Basically think of it as...<br>
<br>
X + Y = 0.04565<br>
46 X + 92 Y = 2.3<br>
<br>
<br>
Multiply the first equation by -46 and then add the two equations
together to get Y<br>
<br>
46 Y = 0.2001<br>
Y = 0.00435<br>
<br>
Substitute Y back into either equation to get X<br>
<br>
X = 0.0413<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>
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