2. Ju s t like a dozen re p re s e nts 1 2 of s om e th ing,
s u ch as d onu ts , igu anas , ch e m is try as s ignm e nts , e tc.,
a mole als o re p re s e nts an am ou nt of s om e th ing.
It is 6.02 x 1 0 23 of s om e th ing. A m ole can
re p re s e nt 6.02 x 1 0 d onu ts , igu anas , toe s , e tc.
23
In ch e m is try, it is norm ally u s e d to re p re s e nt
an am ou nt of atom s , ions , m ole cu le s , or form u la
u nits .
C olle ctive ly, atom s , ions , m ole cu le s , or form u la
u nits are calle d re p re se ntative p articl s . e
3. Because chemists deal with such
large amounts of particles,
it is easier to work with moles of particles
4. amounts of particles can be expressed
not only as moles,
but as mass (grams),
as volume (liters), and
as individual particles (atoms, molecules,
ions, formula units, etc.)
5. a measurement of a sample
of a molecule, H2O for example,
can be converted O
H
from mass H
to moles
to particles
to volume
and back again
to any unit of measurement desired
7. m as s
m olar m as s
1 m ol 1 m ol
m olar m as s
m oles
1 m ol
6 .02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
8. m as s
m olar m as s
1 m ol 1 m ol
m olar m as s
m oles
1 m ol
6 .02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
9. m as s
m olar m as s
1 m ol 1 m ol
m olar m as s
m oles
1 m ol
6 .02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
10. m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m oles
1 m ol
6 .02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
11. m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
12. m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
13. m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
14. m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
15. 35 g Al m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m oles
1 m ol
6 .02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
16. 35 g Al m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
? moles Al m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
17. 35 g Al x 1 mol m a ss
27 g
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
18. 35 g Al x 1 mol m a ss
27 g
35 g Al x 1 mol m olar m as s
= 1 m ol 1 m ol
27g m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
19. 35 g Al x 1 mol m a ss
27 g
35 mol Al m olar m as s
= 1 m ol 1 m ol
27 m olar m as s
= 1.3 mols Al m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
20. m a ss ? mass SiO2
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s 0.8 moles SiO2
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
21. m a ss ? mass SiO2
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s 0.8 moles SiO2
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
22. 60.1 g SiO2
m a ss 0.8 moles SiO2 x
1 mole SiO2
m olar m as s = 0.8 x 60.1 g SiO2
1 m ol 1 m ol
m olar m as s = 48.1 g SiO2
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
repres entative
particles
23. m as s
m olar m as s
1 m ol 1 m ol
m olar m as s
m oles
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
r e p r e s e n t a t iv e
p a r t ic le s
24. 200 g N2O
m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
r e p r e s e n t a t i v e ? molecules N2O
p a r tic le s
25. 200 g N2O
m a ss
m olar m as s
1 m ol 1 m ol
m olar m as s
m o le s
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol
22.4L
6.02 x 10 23 particles
1 m ol
volum e
at S TP num ber of
r e p r e s e n ta tiv e ? molecules N2O
p a r tic le s
26. 1 mole N2O 6.02 x 1023 molecules N2O
200 g N2O x x
44.0 g N2O 1 mole N2O
m a ss 200 x 6.02 x 1023 molecules N2O
=
44.0
m olar m as s 24
1 m ol 1 m ol = 2.74 x 10 molecules N2O
m olar m as s
this
m o le s is so
1 m ol
6.02 x 10 23 particles
22.4L
1 m ol 1 m ol cool!
22.4L
6.02 x 10 23 particles
!
1 m ol
volum e
at S TP num ber of
r e p r e s e n ta tiv e
p a r tic le s