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CHEM 343 Chapter Notes - Chapter 5.1-5.5: Oxford University Press, Vehicle Identification Number, Electronvolt

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School
UW-Madison
Department
Chemistry
Course
CHEM 343
Professor
Aubrey Ellison

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Document Summary

~~----:t0 "b"o r t h . u. t-ccy\. tc e>. J in h":{_cly-o\o~"

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Related Questions


<p>The enthalpy of vaporization of acetone is 32.0kJ/mol. Thenormal boiling point of acetone is 56.5 degrees Celcius. What isthe vapor pressure of acetone at 25&#160;degreesCelcius?</p>
<p>Ok I think I need to use the Clausius-Clapeyronequation:&#160;</p>
<pre> <em>P</em><sub>1</sub> <spanstyle="font-family:symbol;">D</span><em>H</em><sub>vap</sub>1 1
ln (---) = ---- (--- - ---)
<em>P</em><sub>2</sub><em>R</em><em>T</em><sub>2</sub><em>T</em><sub>1</sub></pre>
<p>but then I only have 4 out of the 6 unknowns, delta H, T2,T1 and R. If this is the correct method, then how do I findP1?</p>

Ok, so this problem has no examples or anything, and nothingtalksabout it in the previous chapters. Could anyone help me? Ihavetried doing it on my own and looking back on work but I can'tseemto figure it out.


This is the problem: Remote controlled model boats arepoweredby burning methanol or a racing mixture of 80% methanol and20%nitromethane by mass. Te standard enthalpies of formation ofliquidmethanol and nitromethane are, respectively, -283.6 kJ/moland-74.78 kJ/mol. a) Draw structural diagrams for all reactantsandproducts. b) Calculate the percentage change in energyoutputachieved by using a racing mixture. Our teacher gave us thisaswell: CH3NO2 + O2 --> CO2 + 3/2 H2O + NO So I'm guessingthatwould be the equation for nitromethane...but if I have to doaformation equation shouldn't it be only 1 equation? And so Ineedto make a second one for the combustion of methanol? If Icanunderstand that, I'm sure I can do the rest no problem, but thisiswhere I am stuck.