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.

* So, the molar mass of H₂O is (2 * 1 g/mol) + 16 g/mol = 18 g/mol

2. Use the formula:

Mass (g) = moles * molar mass (g/mol)

3. Plug in the values:

Mass (g) = 1.54 moles * 18 g/mol

4. Calculate:

Mass (g) = 27.72 g

Therefore, the mass of 1.54 moles of H₂O is 27.72 grams.