## Chemistry: A Molecular Approach (3rd Edition)

$0.206$ $mol$ $HCl$
Determine the limiting reactant. Choose one of the reactants and determine how much we need compared to how much is available. We choose to compare HCl. $0.652 mols$ $HCl (avaliable)$ $0.223 mols$ $FeS$$\times\frac{2 mol HCl}{1 mol FeS}$$=0.446$ $mols$ $HCl (needed)$ The moles of excess reactant is found by subtracting the needed amount from the available amount. Excess amount of $HCl$ = $avaliable - needed$ =$0.652$ $mols$ - $0.446$ $mols$ $HCl$ =$0.206$ $mols$ $HCl$