1. Find the molar mass of water (H₂O):
* Hydrogen (H) has a molar mass of 1.01 g/mol.
* Oxygen (O) has a molar mass of 16.00 g/mol.
* Molar mass of H₂O = (2 * 1.01 g/mol) + (1 * 16.00 g/mol) = 18.02 g/mol
2. Use the formula:
* Moles = Mass / Molar Mass
3. Calculate the moles:
* Moles = 4.50 g / 18.02 g/mol
* Moles ≈ 0.250 mol
Therefore, there are approximately 0.250 moles in 4.50 grams of H₂O.
