Answer: 2 moles of 'E' will be formed.
Step-by-step explanation:
Reaction follows:

By Stoichiometry,
3 moles of 'A' is producing 1 mole of 'E'
Therefore, 6 moles of A will produce =
moles of 'E'
6 moles of reactant 'A' is producing 2 moles of 'E' for a given reaction.