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cooltowl
 one year ago
PLEASE HELP!!
Determine the mass percent of iron in Fe2O3 to four significant figures.
Use the following atomic masses: Fe, 55.85 amu; O, 16.00 amu
cooltowl
 one year ago
PLEASE HELP!! Determine the mass percent of iron in Fe2O3 to four significant figures. Use the following atomic masses: Fe, 55.85 amu; O, 16.00 amu

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matt101
 one year ago
Best ResponseYou've already chosen the best response.1All you need to do is divide the mass of iron in Fe2O3 by the total mass of Fe2O3. You have 2 Fe atoms, so the total mass is 55.85 x 2 = 111.7 amu The total mass of Fe2O3 is 111.7 + 16 x 3 = 159.7 amu So, the % mass of iron will be 111.7/159.7 x 100 = 69.94%
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