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April 20, 2014

Homework Help: Chemistry

Posted by Chris on Monday, October 29, 2012 at 2:23am.

A sample weighing 3.064 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96).

When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not react.

If the sample residue weighs 2.407 g, what is the mass fraction of Fe2O3 in the original sample?


I am not exactly sure where to start with this question. Would this be correct?

Mass of Fe2O3 = [(2.407 g - mass of Al2O3) / 55.85 g/mol] x (1 mol Fe2O3 / 2 mol Fe) x 159.69 g/mol

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