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Using Conversion Factors. a mole also represents an amount of something. It is 6.02 x 10 of something. A mole can represent 6.02 x 10 donuts, iguanas, toes, etc. In chemistry , it is normally used to represent an amount of atoms, ions, molecules, or formula units.

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Using

Conversion

Factors


a mole also represents an amount of something.

It is 6.02 x 10 of something. A mole can

represent 6.02 x 10 donuts, iguanas, toes, etc.

In chemistry, it is normally used to represent

an amount of atoms, ions, molecules, or formula

units.

Collectively, atoms, ions, molecules, or formula

units are called representative particles.

23

23

Just like a dozen represents 12 of something,

such as donuts, iguanas, chemistry assignments, etc.,


Because chemists deal with such

large amounts of particles,

it is easier to work with moles of particles


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.)


O

H

H

a measurement of a sample

of a molecule, H2O for example,

can be converted

from mass

to moles

to particles

to volume

and back again

to any unit of measurement desired


this is so cool!!

using

the right

conversion

factors



35 g Al

? moles Al


1 mol

35 g Al x

27 g


1 mol

35 g Al x

27 g

35 g Al x 1 mol

27g

=


=

1.3 mols Al

1 mol

35 g Al x

27 g

35 mol Al

27

=


? mass SiO2

0.8 moles SiO2


? mass SiO2

0.8 moles SiO2


60.1 g SiO2

1 mole SiO2

0.8 moles SiO2x

= 0.8 x 60.1 g SiO2

= 48.1 g SiO2


200 g N2O

? molecules N2O


200 g N2O

? molecules N2O


23

1 mole N2O 6.02 x 10 molecules N2O

44.0 g N2O 1 mole N2O

this is so cool!!

200 g N2O x x

23

200 x 6.02 x 10 molecules N2O

44.0

=

24

= 2.74 x 10 molecules N2O


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