Answer: 4 moles of Na are needed to produce 4 moles of NaCl
Step-by-step explanation:
The balanced chemical equation is :
According to stoichiometry :
2 moles of
are formed from = 2 moles of

Thus 4 moles of
will be formed from =
of

Thus 4 moles of Na are needed to produce 4 moles of NaCl