Question

What does 1 Mole of water molecules has?

Answer 1

One mole:

• "One mole contains exactly $6.02214076\times {10}^{23}$ elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, and is known as the Avogadro number."
• It is expressed in the unit ${\mathrm{mol}}^{-1}$.

One mole of Water $\left({\mathrm{H}}_2\mathrm{O}\right)$:

• Water is made up of two hydrogen atoms and one oxygen atom.
• One mole of the water molecule has $18.02\mathrm{g}$ this can be calculated by adding the masses of a number of atoms involved in the formation of the water molecule i.e. 2 hydrogen atoms and one oxygen atom.
• $\mathrm{Mass}\mathrm{of}\mathrm{water}=(2\times 1.008)+16.00\approx 18.02\mathrm{g}$