Molar Mass

Molar Mass - The mass of one mole of a substance. (Mass is in grams)
                      - Measured in g/mole
                      - Mass could be found using the atomic mass on the periodic table

Molar Mass of Compounds
   To find the molar mass of compounds add the mass of all atoms.
  
Element                                 Molar Mass
H20                                      2(1.0) + 16.0 = 18.0 g/mol
NO2                                     14.0 + 2(16.0) = 46.0 g/mol
NaCl                                     23.0 + 35.5 = 50.5 g/mol

*Always remember Significant Digits.

Then there is converting between grams and moles
   We use molar mass as the conversion factor to convert mass and mole.

Example

Find the mass of  0.89mol of CaCl2

0.89mol x     111.1   g              = 98.879g   = 99g                40.1 + 2(35.5) = 111.1
                 ------------
                         1    mol

Determine the number of moles of C5H12 that are in a 362.8g of the compound.

362.8g x         1      mol           = 5.039mol                           5(12.0) + 12(1.0) = 72.0
               --------------
                     72.0    g