Here's how to calculate the number of moles of water in 75 grams:

1. Find the molar mass of water (H₂O):

* Hydrogen (H) has a molar mass of approximately 1 g/mol.

* Oxygen (O) has a molar mass of approximately 16 g/mol.

* Molar mass of H₂O = (2 * 1 g/mol) + 16 g/mol = 18 g/mol

2. Use the formula: moles = mass / molar mass

* moles = 75 g / 18 g/mol

* moles ≈ 4.17 mol

Therefore, there are approximately 4.17 moles of water present in 75 grams.