Question

If 1.00 mol of CS2 is combined with 1.00 mol of O2, identify the limiting reactant

Answer 1

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.