Question

How many moles of water are present in one litre of water ?

Answer 1

$H_{2}O\to H+H+O$

Total atomic mass $=1.000+1.000+15.999=10.015gm$

A liter is 100gm of water $=\dfrac{1000}{10.015}=55.55

So,55.55 moles are present in 1L of water.