In the synthesis reaction between sodium (Na) and chlorine gas (Clâ‚‚) to produce sodium chloride (NaCl), the balanced equation is:
\[ 2 , \text{Na} + \text{Cl}_2 \rightarrow 2 , \text{NaCl} \]
From this equation, we can see that 2 atoms of sodium combine with 1 molecule of chlorine gas to produce 2 molecules of sodium chloride (NaCl).
So, for every reaction involving 2 sodium atoms and 1 chlorine molecule, 2 molecules of sodium chloride are produced.