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<p>Students -- I got my COVID booster on Friday afternoon and am now
"down" with fever and many of the other COVID symptoms. It's a
big weekend for many of you to knock out some homework. I will
try to check e-mail every few hours and respond to questions, but
my pace is a bit slower this weekend for obvious reasons.</p>
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<p>One thing that I did want to try to clear up because several of
you have asked about it relates to the notation that the book
uses. When you see in your text
<math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mi
mathvariant="normal">Δ</mi><mi>r</mi></msub><mi>X</mi></mrow><annotation
encoding="TeX">\Delta_r X</annotation></semantics></math>,
where X is some quantity, it is referring to that quantity for the
reaction.<br>
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<div class="moz-cite-prefix"><math display="block"
xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mi
mathvariant="normal">Δ</mi><mi>r</mi></msub><mi>X</mi><mo>=</mo><mi
mathvariant="normal">Δ</mi><msub><mi>X</mi><mrow><mi>r</mi><mi>x</mi><mi>n</mi></mrow></msub><mo>=</mo><munderover><mo>∑</mo><mrow><mi>i</mi><mo>=</mo><mn>1</mn></mrow><mrow><mi>P</mi><mi>R</mi><mi>O</mi><mi>D</mi></mrow></munderover><msub><mi>n</mi><mi>i</mi></msub><msub><mi>X</mi><mi>i</mi></msub><mo>−</mo><munderover><mo>∑</mo><mrow><mi>j</mi><mo>=</mo><mn>1</mn></mrow><mrow><mi>R</mi><mi>E</mi><mi>A</mi><mi>C</mi><mi>T</mi></mrow></munderover><msub><mi>n</mi><mi>j</mi></msub><msub><mi>X</mi><mi>j</mi></msub></mrow><annotation
encoding="TeX">Δ_rX=\Delta X_{rxn}=\sum_{i=1}^{PROD}n_i X_i
−\sum_{j=1}^{REACT}n_j X_j</annotation></semantics></math></div>
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<div class="moz-signature">This is shown for enthalpy in equation
2.28 of your text -- but I wanted you to be able to compare it to
the notation I use in the slides which is more general. Also,
some of you have asked about how to convert between
<math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><msub><mi>C</mi><mi>p</mi></msub><annotation
encoding="TeX">C_p</annotation></semantics></math> and
<math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><msub><mi>C</mi><mi>v</mi></msub><annotation
encoding="TeX">C_v</annotation></semantics></math>. The
conversion is shown in equatino 2.48 of the text.</div>
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<div class="moz-signature">Keep the questions coming. We'll get
through this!<br>
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<div class="moz-signature">-- <br>
<b><i>Andrew J. Pounds, Ph.D.</i></b><br>
<i>Professor of Chemistry and Computer Science</i><br>
<i>Director of the Computational Science Program</i><br>
<i>Mercer University, Macon, GA 31207 (478) 301-5627</i></div>
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