In your experiment you weigh out 0.995 g NaHCO3. How much 1.0 M HCl should you add to get
the most NaCl?
NaHCO3 + HCl ==> NaCl + H2O + CO2
mols NaHCO3 = grams/molar mass
mols NaHCO3 = mols HCl (from the coefficients in the balanced equation.)
mols HCl = M x L. You know M and mols, solve for L.