Posted by Chelsy on Wednesday, March 4, 2009 at 6:28pm.
a). Multiply the atomic mass of Al by 2 = _____?
b). Multiply the atomic mass of O by 3 = _____?
c). Add (a) and (b) to get the formula mass of Al2O3
d). Find the % of Al in Al2O3:
%Al = [(a)/(c)]*(100)
e). Multiply the mass of Al2O3 given in the question by the % of Al. Divide the answer by 100 to get the mass of Al in the sample. It should be less than 9.8 g.
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