Explanation:
The given chemical equation is as follows.
\(2Na + Cl_{2} \rightarrow 2NaCl\)
In order to balance the equation, the number of reactants must be equal to the number of products. So, when four moles of sodium reacts then the chemical equation will be as follows.
\(4Na + 2Cl_{2} \rightarrow 4NaCl\)
Thus, we can conclude that when four moles of sodium reacts then two moles of chlorine gas will react.
