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On 10/25/2016 06:47 PM, Hayley Darlene Harrod wrote:<br>
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<p>Dr. Pounds, </p>
<p>In order to calculate delta H for the lab, do we add together
the mass of the solid and the solution?</p>
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For experiment 2 and 4 yes.<br>
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<p> And how do we find the mass of HCl when we aren't given its
density? <br>
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<br>
The product of the reactions is saltwater, for which you have the
density.<br>
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<p>Also, I'm confused n the next part dealing with reactions.
How are we suppose to manipulate the second and third
reactions to generate the fourth? </p>
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Remember Hess' law. If the second and third reactions can be added
together to give the fourth reaction, then you should be able to add
the enthalpies of reactions 2 and 3 to come up with a theoretical
enthalpy for reaction 4 to be compared with your experimentally
determined value.<br>
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<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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