When FeCl3 is ignited in an atmosphere of pure oxygen, this reaction takes place.
4FeCl3(s) + 3O2(g) → 2Fe2O3(s) + 6Cl2(g)
If 3.00 mol of FeCl3 are ignited in the presence of 2.00 mol of O 2 gas, how much of which reagent is present in excess and therefore remains unreacted?
a) 0.33 mol FeCl3 remains unreacted
b) 0.67 mol FeCl3 remains unreacted
c) 0.25 mol O2 remains unreacted
d) 0.50 mol O2 remains unreacted
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