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Molar Mass
and
Percent
Composition
What is an atomic mass unit?
Carbon’s atomic mass =12.01 amu
Molar mass of an atom:
the average atomic mass
expressed in grams.
Example:
1 mol of carbon = 12.01 g
Examples
What is the mass of 1 mol of
potassium atoms?
1 mol = 39.10 g
What is the mass of 1 mol of
iron atoms?
1 mol = 55.85 g
Finding Molar Mass of
Compounds
1. List all atoms found in compound.
2. Count # of atoms of each element.
3. Find atomic mass for each element
on periodic table.
4. Multiply # of atoms by atomic
mass.
5. Add it all up! (units: grams)
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