The aluminum in a 1.200-g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia as the hydrous Al2O3 • xH2O. The precipitate was filtered and ignited at 1000°C to give anhydrous Al2O3, which weighed 0.2001 g. Express the result of this analysis in terms of
(a) % NH4Al(SO4)2.
(b) % Al2O3.
(c) % Al.
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