concentration of ammonium chloride produced when 21.0 mL of 11.9 M HCL and 18.0mL of 7.50M NH3 are mixed?

HCl + NH3 ==> NH4Cl

mols HCl = M x L = ?
mols NH3 = M x L = ?
Which is smaller? That is the amount of NH4Cl formed,