[CHM 111] Jamie Hlebec, CHM 111, lab question

[Andrew J. Pounds]

On 9/19/20 1:57 PM, wrote:
> Good afternoon Professor Pounds,
>
> I am finishing up my lab report and I keep getting confused on how to 
> calculate and find the mass of alum both theoretical and actual.  
> Thank you for your help and I hope you have a great day!
>
> _____________
>

So we discussed in class how, after going through all four of the 
reaction equations, the stoichiometric relationship between aluminum and 
alum is 1 to 1 -- for each mole of aluminum you should produce a mole of 
alum.


To calculate the theoretical yield of alum you should then take the mass 
of aluminium that you initially massed, divide that number by the molar 
mass of aluminium and then multiply by the molar mass of the alum.


To compute the percent yield take the actual mass of alum that you had 
at the end, divide by the theoretical yield, and multiply that result by 
100.


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Director of the Computational Science Program
Mercer University,  Macon, GA 31207   (478) 301-5627

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