If 1.00 mol of cs2 is combined with 1.00 mol of o2, identify the limiting reactant

CS₂ reacts with O₂ and forms CO₂ and SO₂ as the products. The balance equation for the reaction is
                   CS₂     +     3O₂      →     CO₂     +     2SO₂
Initial       1.00 mol   1.00 mol
Reacted  1 / 3 mol   1.00 mol
Final        2/3 mol             -                1/3 mol       2/3 mol
 
The stoichiometric ratio between CS₂ and 3O₂ is 1 : 3.

Hence, limiting agent is O₂.