Answer:
The moles of barium hydroxide required for neutralization is 0.2155 moles.
Step-by-step explanation:

According to the reaction, 2 moles of acetic acid reacts with 1 mole of barium hydroxide .
Then 0.431 mol of acetic acid will react with:
of barium hydroxide.
The moles of barium hydroxide required for neutralization is 0.2155 moles.