1. Balanced Chemical Equation

The reaction between lithium oxide (Li₂O) and water (H₂O) produces lithium hydroxide (LiOH):

Li₂O + H₂O → 2LiOH

2. Mole Ratio

From the balanced equation, we see that 1 mole of Li₂O reacts with 1 mole of H₂O.

3. Calculation

Since we have 2.2 moles of Li₂O, we need an equal number of moles of water to react completely.

Therefore, 2.2 moles of water are needed to react with 2.2 moles of Li₂O.