An ore contains Fe3O4 and no other iron. The iron in a 54.6-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 11.8 g. What was the mass of Fe3O4 in the sample of ore?Answer in units of g
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2Fe3O4 will give 3Fe2O3 [ continuity of iron atoms to each compound] molar mass Fe3O4 is 232 molar mass Fe2O3 is 160 The relationship tells you 160 x 3 480g Fe2O3 comes from 232 x 2 464g Fe3O4 now use simple proportion to get answer 11.8g Fe2O3 comes from 464/480 x 11.8g Fe3O4 answer
