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Molar Mass
Thursday, November 18, 2010 /7:18 PM

Molar Mass
Mass of Atoms:
- the mass (in grams) of 1 mole of a substance is called the molar mass
- it can be determined from the atomic mass on the periodic table
- measured in g/mol

Molar mass of compounds:
- to determine the molar mass of a compound ad the mass of all the atoms together.

EXAMPLES:
Element                        Molar Mass

H2O2               2(1.0) + 2(16.0) = 36.0 g/mol    
LiF                        6.9 + 19.0 = 25.9 g/mol             
BeCl2                  9.0 + 2(35.5) =  80.0 g/mol   

Molar Conversions:
- converting between grams and moles
- to convert between mole and mass we use molar mass as the conversion factor
- be sure to cancel the appropriate units

eg. How many grams is there in 2.8 mol of K?
2.8 mol x 39.1g / 1mol =  109.48 g/mol = 109 g/mol

eg. How many moles are there in 80g of BeS?
80g x 1mol/ 41.1g = 1.94mol = 1.9mol

~christina :]