The aluminum in a 1.200g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia as the hydrous Al2O3 · XH2O. The precipitate was filtered and ignited at 100°C to give anhydrous Al2O3, which weighed 0.2001 g. Express the result of this analysis in terms of % Al.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".