Molar Mass!

Today during chemistry class, Mr. Doktor taught us how to find the molar mass of a substance and a compound.

•The mass (in grams) of 1 mole of a substance if called the molar mass.

•It can be determined from the atomic mass on the periodic table.

•It is measure in g/mol

Ex. Iron(Fe) – 55.8 g/mol
Ex. Oxygen (O2) – 2(16) = 32.0 g/mol


Molar Mass of Compounds

• To determine the molar mass of a compound add the mass of all the atoms together.

Ex. NaCl-------- 23 + 35.5 = 58.5 g/mol
Ex. AlCl3------- 27 + 3(35.5) = 133.5 g/mol