Here's why:

* Molar Mass: The molar mass of water (H₂O) is approximately 18.015 g/mol. This means that 1 mole of water weighs 18.015 grams.

* Calculation: To find the mass of 1.000 mole of water, you would multiply the molar mass by the number of moles:

1.000 mole H₂O * 18.015 g/mol = 18.015 g H₂O

Therefore, 1.000 mole of H₂O corresponds to 18.015 g H₂O, not 0.05549 g H₂O.