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<div class="moz-cite-prefix">On 2/10/21 6:25 PM, wrote:<br>
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cite="mid:87fd2c78f2a442629146d6c4590554d1@SA1PR01MB6528.prod.exchangelabs.com">
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Dr. Pounds, </div>
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I am confused on how to find standard molar heat capacity of
something like O2 or H2. </div>
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For example for problem 3.22 part B, the only way I have been
able to solve it is by using values for standard molar heat
capacity for O2 and H2 (which I found by looking up because I
was confused). I'm assuming that is not something that will be
given since they were not given for the homework and I could not
find a table in the book. So I think I am just missing how to
find these.</div>
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Thanks,</div>
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<p><br>
</p>
<p>Your book (and thus Mastering) is REAL GOOD about asking you
questions that require you to look things up in the text. In fact
-- for those of you that haven't noticed -- the Mastering problems
are essentially a selection of the problems from the text. For
this reason it is assumed that you will have your text and all of
the tables and examples available when you are working the
problems. I, in general, tried to select problems from the end of
the chapter that had an example worked in the chapter or were very
similar to problems you might have seen before. For example --
look at example 3.4 on page 69 of your text and the table
referenced therein.<br>
</p>
<p><br>
</p>
<p>If you have gone through the chapter and worked the examples
there and then progressed to the end of chapter problems then you
should at least have a good idea where to look for the information
you need. <br>
</p>
<p><br>
</p>
<p>Now, on a test you will not have your text handy and I will have
to provide you any standard molar heat capacities. There are a
few exceptions to this. If I asked you to estimate the molar heat
capacity based on degrees of freedom (rotation, translation,
vibration) using things like the law of Dulong and Petit - or if I
provided you with an equation for the temperature dependence of
the heat capacity, e.g. --<br>
</p>
<p><br>
</p>
<p><font size="+1"><math xmlns="http://www.w3.org/1998/Math/MathML"
display="block"><semantics><mrow><msubsup><mi>C</mi><mrow><mi>p</mi><mo>,</mo><mi>m</mi></mrow><mo>∘</mo></msubsup><mo>=</mo><mi>α</mi><mo>+</mo><mi>β</mi><mi>t</mi><mo>+</mo><mi>γ</mi><msup><mi>t</mi><mn>2</mn></msup><mo>+</mo><mi>δ</mi><msup><mi>t</mi><mn>3</mn></msup><mo>+</mo><mfrac><mi>η</mi><msup><mi>t</mi><mn>2</mn></msup></mfrac></mrow><annotation
encoding="TeX">C^{\circ}_{p,m}=\alpha +\beta t + \gamma
t^2 + \delta t^3 + \frac{\eta}{t^2}</annotation></semantics></math></font></p>
<p>which has to be done only when the heat capacity for the compound
is known to change significantly over the temperature range
given. Even in that case I would have to provide you coefficients
(alpha, beta, etc.)</p>
<p><br>
</p>
<p><br>
</p>
<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
Director of the Computational Science Program
Mercer University, Macon, GA 31207 (478) 301-5627
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