If 3mol of fecl3 are ignited in the presence of gas o2

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Question- If 3mol of FeCl3 are ignited in the presence of 2mol O2 gas how much of which reagent is present in excess and therefore unreacted?

4FeCl3 + 3O2 ---> 2Fe2O3 + 6Cl2

The answer is .33 mol of FeCl3

Hello Experts please provide me the detailed computation for above question

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