for the reaction shown find the limiting reactant for each of the following initial amounts of reactants

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4Cr(s)+3O2(g)→2Cr2O3(s)

Part A:

1 molCr; 1 molO2 Express your answer as a chemical formula.

Part B:

4 molCr; 2.5 molO2 Express your answer as a chemical formula.

Part C:

12 molCr; 10 molO2 Express your answer as a chemical formula.

Part D:

14.8 molCr; 10.3 molO2 Express your answer as a chemical formula.