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Solving a problem in chemistry section 10 point 36

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36. The iron oxide Fe3O4 weighing 10 g was initially treated with 150 ml of hydrochloric acid (density 1.1 g / ml) with a mass fraction of 20% hydrochloric acid, and then the resulting solution was added an excess of iron. Determine the solution composition (in% by weight).
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)
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