* 1 mol hydrogen atoms (H) weigh 1.0 g, 1 mol helium atoms (He) weigh
4.0 g, .....
As molecules as well as
lattices of elements
and compounds are formed by reaction of atoms, the mass of 1 mol of them
can easily be calculated:
* 1 mol hydrogen molecules (H2): 1.0 + 1.0 g
= 2.0 g
* 1 mol watser molecules (H2O):
1.0 + 1.0 + 16.0g = 18.0 g
* 1 mol sulfur molecules
(S8): 8 x 32.1 g
= 256.8 g
* 1 mol sodium chloride (NaCl): 23.0 + 35.5 g
= 58.5 g