Roughly what mass does one mole of water molecules have?

1. One water molecule weighs approximately 18 amu. 2. Formula mass in amu and molar mass in g/mol are numerically equal. 3. One mole of water molecules therefore weighs approximately 18 g. 4. The figure 0.03 g is the mass of a single small drop of water, a tiny fraction of a mole. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_