Question

How many water molecules are present in one ml of water (d=1 gm/ml)?

Answer 1

As density=m/v and v=1 ml therefore mass =1 gm
Now using mole concept
Given mass/molar mass = no. Of molecules / Avogadro no.
1/18(molar mass of h2o)=n/6.022*10^23
From this n comes out to be 0.334*10^23 or 3.34*10^22
Hope u understood