Using Conversion Factors

UsingConversionFactors

Just like a dozen represents 12 of something,such as donuts, iguanas, chemistry assignments, etc.,

a mole also represents an amount of something.It is 6.02 x 10 of something. A mole canrepresent 6.02 x 10 donuts, iguanas, toes, etc.In chemistry, it is normally used to representan amount of atoms, ions, molecules, or formulaunits.Collectively, atoms, ions, molecules, or formulaunits are called representative particles.

23

23

Because chemists deal with suchlarge amounts of particles,it is easier to work with moles of particles

amounts of particles can be expressednot only as moles, but as mass (grams),as volume (liters), andas individual particles (atoms, molecules,

ions, formula units, etc.)

a measurement of a sampleof a molecule, H2O for example,can be convertedfrom massto molesto particlesto volumeand back againto any unit of measurement desired

OH

H

usingthe right

conversionfactors

this is so cool!

!

number ofrepresentative

particles

mass

1 mol22.4L

22.4L1 mol

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

number ofrepresentative

particles

mass

1 mol22.4L

22.4L1 mol

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

number ofrepresentative

particles

mass

1 mol22.4L

22.4L1 mol

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

number ofrepresentative

particles

mass

1 mol22.4L

22.4L1 mol

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

number ofrepresentative

particles

mass

1 mol22.4L

22.4L1 mol

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

35 g Al

35 g Al

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

? moles Al

35 g Al x 1 mol27 g

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

35 g Al x 1 mol27 g

35 g Al x 1 mol 27g=

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

35 g Al x 1 mol27 g

35 mol Al 27=

= 1.3 mols Al

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

0.8 moles SiO2

? mass SiO2

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

0.8 moles SiO2

? mass SiO2

number ofrepresentative

particles

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

0.8 moles SiO2 x 60.1 g SiO2

1 mole SiO2

= 0.8 x 60.1 g SiO2

= 48.1 g SiO2

number ofrepresent at ive

part icles

mass

1 mol22.4L

22.4L1 mol

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

n u m b er o frep resen ta tiv e

p a rtic les

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

200 g N2O

? molecules N2O

n u m b er o frep resen ta tiv e

p a rtic les

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

200 g N2O

? molecules N2O

n u m b er o frep resen ta tiv e

p a rtic les

6.02 x 10 particles1 mol

23

6.02 x 10 particles231 mol

1 molmolar mass

molar mass1 mol

moles

volumeat STP

mass

1 mol22.4L

22.4L1 mol

200 g N2O x x1 mole N2O 6.02 x 10 molecules N2O44.0 g N2O 1 mole N2O

23

200 x 6.02 x 10 molecules N2O44.0

23=

= 2.74 x 10 molecules N2O24

this is so

cool!!