chemistry

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When 9.8g of aluminum oxide(Al2O3) decomposes, how many frams of aluminum metal are produced?

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    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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