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hakdog1234:
A solid mixture containing only Fe2O3 and Al2O3 weighs 0.6432 grams. The mixture is heated with H2, reducing Fe2O3 to Fe, leaving Al2O3 unchanged. The mixture now weighs 0.5448 grams after the reduction process. Calculate the percentage aluminum in the sample.

Borek:
https://www.chemicalforums.com/index.php?topic=65859.0

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