# The molecular mass of water is 18.02 amu. What is the mass of Avogadro’s number of water molecules?

Jul 9, 2017

$18.02$ $\text{g}$
The mass in $\text{amu}$ of one unit of a substance is equivalent to the mass in $\text{g}$ of one mole of that substance
Therefore, if one water molecule has a mass of $18.02$ $\text{amu}$, one mole ($6.022 \times {10}^{23}$ $\text{H"_2"O}$ molecules) of water has a mass of color(red)(18.02 color(red)("g".