1. Calculate the formula weight of Al[C9H6ON]3. 2. A solution is prepared by dis

Question

1. Calculate the formula weight of Al[C9H6ON]3. 2. A solution is prepared by dissolving 4.0115 g of a solid unknown in a 250 ml volumetric flask. A 10.00 ml aliquot of this solution is pipetted into a beaker for a gravimetric determination using 8-hydroxyquinoline. If the precipitate, after subtracting the crucible and microfilter, weighed 1.2176 g, what is the wt% Al3+ in the original solid sample? 3. A mixture containing only Al2O3 (MW 101.96 g/mol) and Fe2O3 (MW 159.69 g/mol) weighs 2.019 g. When heated under a stream of H2, the Al2O3 is unchanged, but the Fe2O3 is converted to metallic Fe plus H2O(g). If the residue weighs 1.774 g, what is the weight percent of Fe2O3 in the original mixture?

Explanation / Answer

Molar mass of Al(C9H6ON)3 is 459.4341 ± 0.0003 g/mol http://www.scribd.com/doc/49821343/tutorial-6

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