November 18, 2010: Molar Mass (Angelo)

Mass of Atoms:
- The mass (in grams) of 1 mole of a substance is the molar mass
- It can be determined from the atomic mass on the periodic table measured in grams per mole (g/mol).
Example:
What is the mass of Copper (Cu)?
63.5 grams  

Molar Mass of Compounds:
- To determine the molar mass of a compound, add the mass of all the atoms together.
Example: 
What is the molar mass of H2O? 
Write out the the mass of each atom and multiply that by its frequency in the compound and calculate: 2(1.0 g) + 1(16.0 g) = 18.0 g/mol.

NOTE: Because we are adding instead of multiplying or dividing figures, we round our final answer to the highest number of significant digits in our equation.