 # How would you calculate the molar mass of water?

The total sum of the masses of the atoms or elements present in the molecule is termed as molecular mass.

## Calculation of Molar mass of a compound

We can find the molecular mass of the molecule by following the given substance:

• Identify the formula of the compound or molecule
• Using the formula determine the number of atoms present in each element of the compound or molecule
• Multiply the atomic weight of each element with the number of atoms of that particular element
• Similarly, do it for all the elements in the molecule or compound
• Add up all the values obtained in the above step
• Then add the unit as grams/mole you will get the molecular mass of the substance

## Molar mass of water

One mole of H2O is made up of 2 moles of hydrogen atoms and 1 mole of oxygen atom.

## Molar mass of atoms

Mass of 1 mole of Hydrogen atoms= 1 g /mol

Mass of 1mole of Oxygen atoms = 16 g/mol

Mass of two moles of Hydrogen atoms = 2x 1 g/mol = 2 g/mol.
Mass of one mole of Oxygen atoms = 1 x 16 g /mol

On adding all the above-obtained values we get,

Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol.