The chemical reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) can make 20 moles of sodium chloride.

The balanced chemical equation for this reaction is:

NaOH + HCl → NaCl + H2O

In this equation, one mole of NaOH reacts with one mole of HCl to form one mole of NaCl and one mole of water (H2O). Therefore, to make 20 moles of NaCl, we need to use 20 moles of both NaOH and HCl.