is it HCl mixed with some sort of solution?
in that case, you would have to use
#Mol of solute/ total solution in L (i think its L) = molarity
you find moles of everything, then you calculate limitent reactant, and use that with the ratios, to find the resulting NaCl solution
if this isnt a solution question then you cant use that above equation, and in this case you would have to know what the limitent reaction is, it must say what is in excess or something like that in the question.