<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<p><font face="serif">I told you in class on Friday that I would be
sending out some help for the Alum lab. As we discussed in
class the relationship between Aluminum to the Alum (potassium
aluminum sulfate dodecahydrate) is 1:1 and aluminum is the
limiting reactant.<br>
</font></p>
<p><font face="serif">For that reason to compute the theoretical
yield of your alum you would divide the mass of aluminum you
massed by the molar mass of aluminum (26.98 g/mol) and then
multiply that by the molar mass of the alum (474.4 g/mol).</font></p>
<p><font face="serif">For example, if you massed out 0.47 grams of
aluminum, your theoretical yield of alum would be.</font></p>
<p><font face="serif">(0.47 g Al) / (26.98 g Al/mol) * (474.4 g
Alum/mol) = 8.26 grams Alum</font></p>
<p><font face="serif">The number of sig figs that you got from the
mass of aluminum should determine the number of sig figs in your
final result.<br>
</font></p>
<div class="moz-signature">-- <br>
<b><i>Andrew J. Pounds, Ph.D.</i></b><br>
<i>Professor of Chemistry and Computer Science</i><br>
<i>Director of the Computational Science Program</i><br>
<i>Mercer University, Macon, GA 31207 (478) 301-5627</i></div>
</body>
</html>