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Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen?

a. 12.0g
b. 23.9g
c. 47.8g
d. 95.6g

2 answers

Write the equation and balance it.
Convert 16.7 g Fe to mols. mol = grams/molar mass
Use the coerfficients in the balanced equation to convert mols Fe to mols Fe2O3.
Now convert mols Fe2O3 to grams. g = mols x molar mass.
23.9
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