Why should the moles of KHCO3 AND THE MOLES OF KCL PRODUCED BE THE SAME?

The moles of KHCO3 and KCl produced should be the same because they are stoichiometrically related in the chemical reaction that produces them. For every mole of KHCO3 that reacts, it produces one mole of KCl. This means that the number of moles of KHCO3 consumed is equal to the number of moles of KCl produced in the reaction.