How to find the molar mass. The molar mass is the sum of all the atomic masses of the elements in a compound.
1. Find the atomic mass of each element in the compound by using the periodic table.
2. If there are any subscripts, multiply the atomic mass by the subscript.
Mn= 55 g/mol O= 16 g/mol
Mg=24 g/mol P=31g/mol O=16g/mol
(3x24) +(2x31)+(8x16)=262 g/mol
This is an important concept to understand because you will need it for other calculations in chemistry. One such case is figuring out the % composition of a compound.
1. Look up the atomic masses in the periodic ...
This solution will discuss how to calculate the following: molar mass, percent composition, empirical formula and molecular formula from percent composition. Examples are provided for each concept.