In 100 grams of water, there are 5.551 moles. To calculate this result:
Calculate the molar mass of water, which is two hydrogen atoms' and one oxygen atom's molar masses combined:
(2 × 1.008 g/mol) + 15.999 g/mol = 18.015 g/mol.
Divide the mass of your sample by the molar mass:
100 g / 18.015 g/mol = 5.551 mol.
This is the number of moles in 100 g of water. Read more