[CHM 111] Question about the Alum Synthesis Lab

[Andrew Pounds]

On 09/16/2015 05:38 PM,  wrote:
>
> Hi Dr. Pounds!
>
>
> MY  and I were wondering how to calculate the theoretical moles of 
> alum. Do we take the theoretical mass of alum and divide it by the 
> actual mass that we produced? How do we approach the problem?
>
>
> Thank you!
>
>

It's just like you did on the prelab and like the the theoretical yield 
problem I did last week in class.

What is difficult is following all the equations to determine what the 
ratio is between the aluminium and the alum.  It is 1 to 1; one mole of 
aluminium produces one mole of alum.   Compute the moles of aluminium 
and then use that to compute the moles of alum.  Use the molar mass of 
the alum and the moles of alum to then determine your theoretical yield.

The percent yield is then the actual yield (what you made) divided by 
the theoretical yield with that quantity multiplied by 100 to give you a 
percentage instead of a fraction.

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

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