1
The mole:
Since atoms
are very tiny and light… more convenient to
consider a collection of them:
1 mole = 6.022 x 10
23
units of something
= Avogadro’s number (N
A
)
This is the number of atoms in exactly 12.000 g of
12
C.
Mass
(g)
Moles
(mol)
Number of
Atoms
Formulas, Chemical Equations and more...
Atomic weight
gives:
C
12.011
Molecular weight (MW)
of a compound = sum of atomic weights
of its constituent elements
E.g.
C
7
H
16
NO
2
+

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