Molar Mass

To find mass follow the steps:

You would first count the number of atoms given in the elements.

Example:
Cl_{3  would have 3 Chlorine atoms.} 

H2O   would have 2 hydrogen atoms and 1 oxygen. 


Then you would  multiply  the hydrogen atoms with the atomic mass. 

Example:
CL3: 3 CHLORINE ATOMS  times 35.453 ( CHLORINE'S ATOMIC MASS).

That is how you find  the Molar mass.