Sodium hydroxide and perchloric acid react to produce sodium perchlorate and water.

1.05 moles of  HClO₄

To answer the question we need to;

1. Write the equation for the reaction;

The equation for the reaction between sodium hydroxide and perchloric acid is given by;

HClO₄ + NaOH → NaClO₄ + H₂O

2. Determine the mole ratio of NaOH to  HClO₄

From the equation;

1 mole of NaOH reacts with 1 mole of  HClO₄.

Therefore; the mole ratio of NaOH to  HClO₄ is 1 : 1

3. Determine moles of  HClO₄ required

Since the mole ratio of NaOH to  HClO₄ is 1 : 1

Then, Moles of NaOH = Moles of  HClO₄

Therefore;

Moles of  HClO₄ = 1.05 moles

We can therefore, conclude that 1.05 moles of  HClO₄ are required to react with 1 mole of NaOH.