The equation for the reaction of sodium hydroxide with hydrochloric acid:
NaOH + HCl = NaCl + H2O
The amount of NaOH substance:
v (NaOH) = m (NaOH) / M (NaOH) = 16/40 = 0.4 (mol).
According to the reaction equation, 1 mol of NaCl is formed from 1 mol of NaOH, therefore:
v (NaCl) = v (NaOH) = 0.4 (mol).
Thus, the mass of the formed sodium chloride:
m (NaCl) = v (NaCl) * M (NaCl) = 0.4 * 58.5 = 23.4 (g).
Answer: 23.4 g.
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