Question

Complete the statement :

1 mole of water molecules has ___ molecules of water and has mass ___ g.

• A. $6.022\times {10}^{23}$
• B. 18

Answer 1

1. 1 mole of water (${\mathrm{H}}_2\mathrm{O}$) molecule = $6.022\times {10}^{23}$ molecules of water.
2. Mass of H₂O = $2\times \left(1\right)+16$ = 18g.

Hence, 1 mole of water molecules has $6.022\times {10}^{23}$ molecules of water and has mass 18 g.