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## PowerPoint Slideshow about ' Using Conversion Factors' - rue

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Presentation Transcript

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.)

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

? moles Al

0.8 moles SiO2

0.8 moles SiO2

? molecules N2O

? molecules N2O

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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