The balanced chemical equation for the reaction between sodium chloride and silver nitrate is:

NaCl ( aq ) + AgNO3 ( aq ) AgCl ( s ) + NaNO3 ( aq )

We can interpret this to mean:

1 mole of sodium chloride and mole(s) of silver nitrate

React to produce:

mole(s) of silver chloride and mole(s) of sodium nitrate