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A sample weighing 3.082 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3...

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Chemistry

A sample weighing 3.082 g is a mixture of Fe2O3 (molar mass =159.69) and Al2O3 (molar mass = 101.96). When heat and a stream ofH2 gas is applied to the sample, the Fe2O3 reacts to form metallicFe and H2O(g). The Al2O3 does not react. If the sample residue (thesolid species remaining after the reaction) weighs 2.637 g, what isthe mass fraction of Fe2O3 in the original sample?

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4.5 Ratings (741 Votes)

Mass of the mixture , m = 3.082 g

Mass of the residue , m' = 2.637 g

So mass of Fe2O3 reacted with H2 is m\" = m - m'

                                                            = 3.082 - 2.637

                                                            = 0.445 g

mass fraction of Fe2O3 is = ( mass of Fe2O3 reacted / mass of the sample )

                                      = 0.445 g / 3.082 g

                                      = 0.144
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