Posted by **Miley** on Sunday, June 8, 2008 at 10:46am.

how many grams of Fe2O3 are formed when 16.7g of Fe reacts completely with oxygen.

4Fe +3O2 --> 2Fe2O3

how do i do this problem..thanks:)

- chemistry -
**GK**, Sunday, June 8, 2008 at 3:55pm
(a) Look up the molar mass of Fe (= the atomic mass of Fe labeled "gFe/mol")

(b) Divide16.7gFe by (a) to get moles of Fe

(c) Multiply (b) by 2molFe2O3/4molFe (or 2/4) to get moles of Fe2O3 produced.

(d) multiply (c) by the formula mass of Fe2O3*

*To find the formula mass of Fe2O3, look up each atomic mass, multiply each by the subscript, and add add them all up.

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