|Class 9 Chemistry Atoms and Molecules||Molar mass|
In order to calculate the molar mass of a respective molecule keep the numerical value same as molecular mass but alter the units from u to g.
For instance, molecular mass of water is 18 u.
We know the atomic mass of hydrogen is 1u and that of oxygen is 16u.
2 X 1 + 1 X 16 = 18u
i.e. 18 u of water has 1 molecule of water.
18u water = 18 g water
18g water = 1 mole molecules of water
Or 18g water = 6.022 X 1023 molecules of water