consider the reaction 2Al + 3Cl2------2AlCl3. A mixture of 1.50 mol of Al and 3.00 mol of Cl2 is allowed to react. A) which is the limiting reactant? B) how many moles of AlCl3 are formed? C)how many moles of the excess reactant remain at the end of the reaction? I get the limiting reactant but not understanding the moles and how many moles of excess reactant.