Here's how to calculate the number of moles in 4.75g of sodium hydroxide (NaOH):

1. Find the molar mass of NaOH:

* Sodium (Na): 22.99 g/mol

* Oxygen (O): 16.00 g/mol

* Hydrogen (H): 1.01 g/mol

Molar mass of NaOH = 22.99 + 16.00 + 1.01 = 40.00 g/mol

2. Use the formula:

* moles = mass / molar mass

3. Plug in the values:

* moles = 4.75 g / 40.00 g/mol

4. Calculate:

* moles = 0.11875 mol

Therefore, there are approximately 0.119 moles of sodium hydroxide in 4.75 grams.