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

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 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 (the solid species remaining after the reaction) weighs 2.637 g, what is the mass fraction of Fe2O3 in the original sample?

Expert Solution

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

queen_honey_blossom answered 1 year ago

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