One mole of any substance contains Avogadro's number of particles, which is approximately 6.022 × 10^23. In the case of water (H2O), one mole of water would contain 6.022 × 10^23 water molecules.
To calculate the mass of one mole of water, we can look at the atomic masses of hydrogen (H) and oxygen (O) and multiply them by their respective subscripts in the water molecule.
The atomic mass of hydrogen (H) is approximately 1.008 grams per mole, and there are two hydrogen atoms in each water molecule. The atomic mass of oxygen (O) is approximately 16.00 grams per mole.
So, the total mass of one mole of water would be:
(2 × 1.008 grams) + (1 × 16.00 grams) = 18.02 grams
Therefore, one mole of water has a mass of approximately 18.02 grams.