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Chemistry 11 Online
OpenStudy (anonymous):

A compound contains 17.5 grams iron and 7.5 grams of oxygen. Determine the empirical formula?

OpenStudy (anonymous):

17.5/The relative atomic mass of Fe (55.8) = 0.3136 7.5/The relative atomic mass of O (16.0) = 0.4688 Both values / Smallest value: Fe: 0.3136/0.3136 = 1 O: 0.4688/0.3136 = 1.495 Both Values * 2 to get whole number(ish) values: Fe: 1x2 = 2 O: 1.495x2 = 2.99 = 3 roughly Empirical Formula = Fe2O3

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