Stoichiometry help? Calculating excess reagents?

You need to find the ratio of products to reagents to see which will be left over. To do this take one and ume the other is in infinite supply. so for prob 1 we first ume that Cl2 is infinite this would mean that al 3.6 mol of Al would be used and since the ratio is 2 to 2 or 1 to 1 3.6 moles of 2AlCl3 would be produced Then with AL in infinite we look at Cl this is kind of tricky but we can see that there are 6 mols of CL in the product and 6 in the reactant side so 5.3 moles would be produced. since the first yields 3.6 and the second 5.3 it has to be the lower which is 3.6. Follow these steps and complete the rest