posted by Chelsy on .
When 9.8g of aluminum oxide(Al2O3) decomposes, how many frams of aluminum metal are produced?
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.