Asked by John

How many grams of iron must be oxidized to produce 5.0g of rust? (Fe2O3)

I have no idea how to solve this!
Answered by Steve
If your reaction is

4Fe + 3O2 -> 2Fe2O3

then it takes 2 moles of Fe to produce 1 mole of rust.

5.0g of rust is 0.0313 moles

So, how many grams of Fe in 0.626 moles?
Answered by John
would it be 10? since it takes double the amount of Fe to make rust. 5.0g of rust is .0313 moles, you would multiply it by 2?
Answered by DrBob222
1. Steve moved the decimal point; that should be 0.0626 mols.
2. John, that answer is not right.
g = mols x molar mass = 0.0626 x 55.85 = ?
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