In the reaction:

NaOH + HCl --> NaCl + H2O

how many moles of water are produced when 1 mole of HCl is neutralized by 1 mole of NaOH?

The equation tells you that 1 mole HCl + 1 mole NaOH produces 1 mole NaCl and 1 mole H2O.

To determine how many moles of water are produced when 1 mole of HCl is neutralized by 1 mole of NaOH, we can use the balanced equation for the reaction.

The balanced equation is:
NaOH + HCl → NaCl + H2O

From the equation, we can see that one mole of HCl reacts with one mole of NaOH to produce one mole of water.

Therefore, when 1 mole of HCl is neutralized by 1 mole of NaOH, 1 mole of water is produced.