We will use just relation between molecular mass and molar mass for water.
First of all, let us consider the molecular mass of water:
- Each atom of hydrogen has a mass equal to 1 AMU (atomic mass unit).
- Each atom of oxygen has a mass equal to 16 AMU.
- Hence, a water molecule (
For any molecule (and also for every atom), its molecular mass in AMU equals to the mass of a mole in grams.
For example, for water: 1 molecule has a mass of 18 AMU, and this implies that 1 mole has a mass of 18 grams. Molecular mass in AMU equals to molar mass in grams. Always, atoms included.
Thus, the number of moles contained in 60 grams of water is: