1. MOLAR MASS OF A SUBSTANCE The molar mass of a substance is the SUM of the ATOMIN MASS NUMBERS of ALL the atoms in the substance. The molar mass of a substance is the SUM of the ATOMIN MASS NUMBERS of ALL the atoms in the substance. –If the substance is an atom, the mass is called ATOMIC MASS –If the substance is a compound, the mass is called molar mass or gram formula mass. –The molar mass of a substance is in the units grams/mole and is NOT affected by coefficients. –The molar mass is an INTENSIVE PROPERTY, and is constant despite the size of your sample.

2. CALCULATION OF MOLAR MASS K Mn O LISTELEMENTSHERE Example, calculate the molar mass of KMnO 4

3. CALCULATION OF MOLAR MASS K1 Mn1 O4 LISTELEMENTSHERE LIST SUBSCRIPTS

4. CALCULATION OF MOLAR MASS K1X Mn1X O4X LISTELEMENTSHERE LIST SUBSCRIPTS MULTIPLY

5. CALCULATION OF MOLAR MASS K1X 24.30 G/MOL = Mn1X 54.93 G/MOL = O4X 15.99 G/MOL = LISTELEMENTSHERE LIST SUBSCRIPTS MULTIPLY INSERT ATOMIC MASS FROM PERIODIC TABLE

6. CALCULATION OF MOLAR MASS K1X 24.30 G/MOL = 24.30 G Mn1X 54.93 G/MOL = 54.93 G O4X 15.99 G/MOL = 63.96 G LISTELEMENTSHERE LIST SUBSCRIPTS MULTIPLY INSERT ATOMIC MASS FROM PERIODIC TABLE Add SUBTOTALS