B) How many moles of Na2O can be produced from 13.5 moles Na?

6.75 moles of can be produced from 13.5 moles Na

Explanation:

The balanced chemical equation  for formation of from Na is:

According to stoichiometry :

4 moles of Na give = 2 moles of

Thus 13.5 moles of give =  of  

Thus 6.75 moles of can be produced from 13.5 moles Na

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

the answers would be

the first one and the second one