What is the percentage mass of iron in the metal ore iron (III) oxide (Fe2O3)?

... .................................370 g . CaO . + .

H2O .? . Ca(OH)2 ................................(74.1 g/mol) 4.99 mol . .

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. 4.99 mol . |______1 to 1 so you need 4.99 moles of CaO but if you round to 2 sig figs, then it's 5.0 mol When you get a good response please consider giving a best answer.

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To convert calcium hydroxide to calcium oxide, use the following equation. Ca(OH)2? CaO + H2O This means the number of moles of calcium oxide is the same as the number of moles of calcium hydroxide.

Calcium hydroxide = Ca(OH)2 Mass of one mole = 40.1 + 2 * 17 = 74.1 grams Number of moles = 370 ÷ 74.1.

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