2Na + Cl2 → 2NaCl
1. How many moles of NaCl can 3.5 moles of Na
produce?

3.5 moles

Explanation:

                                     2Na + Cl2 → 2NaCl

from reaction               2 mol            2 mol

given                           3.5 mol            mol

x = 3.5*2/2 = 3.5 mol

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

yes it is balanced