Study Guide: Accelerated Physical Science, Moles
Terms and definitions
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Atomic mass unit (amu)
Average atomic mass
Mole
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Avogadro’s number
N = 6.022 x 1023 things/mol
Molar mass
Equations / Formulas
For an element:
mol =
mass (g)
----------------atomic mass (g/mol)
# atoms
mass (g) = ----------------- x atomic mass (g/mol)
N
Combining these two equations:
mol =
mass (g)
----------------=
atomic mass (g/mol)
# atoms
-------------N
For a compound:
mol =
mass (g)
-------------------molar mass (g/mol)
# molecules
mass (g) = ----------------- x molar mass (g/mol)
N
Combining these two equations:
mol =
mass (g)
----------------=
molar mass (g/mol)
# molecules
-----------------N
Specific topics to know
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What is average mass of an element
Counting by weighing
Convert among moles, mass, and number of atoms
How to determine molar mass
Convert among moles, mass, and number of molecules
To convert moles to molecules, multiply by N
 To convert molecules to moles, divide by N