[CHM 111] Lab 5

[Andrew J. Pounds]

On 10/25/2016 06:47 PM, Hayley Darlene Harrod wrote:
>
> Dr. Pounds,
>
> In order to calculate delta H for the lab, do we add together the mass 
> of the solid and the solution?
>
For experiment 2 and 4 yes.

> And how do we find the mass of HCl when we aren't given its density?
>

The product of the reactions is saltwater, for which you have the density.

> 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?
>

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.



-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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