The molar mass of water (H2O) is approximately 18.015 grams per mole.
To calculate the mass of 1.25 moles of water, we can use the following formula:
mass = number of moles x molar mass
Substituting the values, we get:
mass = 1.25 moles x 18.015 g/mol
mass = 22.52 g
Therefore, the mass of 1.25 moles of water is approximately 22.52 grams.