Answer: 1.08 moles
Step-by-step explanation:
For every 6 moles of sodium hydroxide consumed, 2 moles of sodium arsenite are produced.
This means that if 3.25 moles of sodium hydroxide are produced, we can set up the proportion:
3.25/6 = x/2, where x is the number of moles of sodium arsenite produced.
It follows that x = 1.08 moles.