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Iron and oxygen gas can react to form the magnetic oxide of iron Fe3O4. How many grams of Fe3O4 can be made from 42.3 g of Fe?

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3Fe + 2O2 ==> Fe3O4

mols Fe = grams/atomic mass Fe = ?
Using the coefficients in the balanced equation, convert mols Fe to mols Fe3O4.
Now convert mols Fe3O4 to grams. g = mols x molar mass = ?

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