Transcript Unit: Chemical Quantities

Unit: Chemical Quantities
Counting Representative Particles
with the Mole
After today, you will be able to…
• Using dimensional analysis,
calculate how many atoms,
molecules, or formula units are in
one mole of that substance
• Use correct significant figures and
units in these calculations
Substances can be measured
in different ways….
The
Mole
can
be
1.Count – 5 apples, dozen eggs
related
each16oz
of
2.Mass
– 2lbs ofto
bananas,
box of cereal
these types of
3.Volume – gallon of milk, pint of
measurements.
cream
1 mole =
23
6.02x10
atoms, molecules, or formula units
= 602,000 ,000,000,000,000,000 ,000
= six-hundred and two sex-tillion
This equality can be used as
a conversion factor to
convert particles into moles,
or moles into particles.
Example: How many atoms are in a
1.22 mole sample of sodium?
K: 1.22 mol Na
U: ? atoms Na
K stands for what we know!
U stands for what we are solving for!
1.22 mol Na x 6.02x1023 atoms Na =
1
1 mol Na
7.34x1023 atoms Na
Example: How many moles are
equal to 4.79x1024 molecules of CO?
K: 4.79x1024 molec. CO
U: ? mol CO
4.79x1024 molec. CO x
1 mol CO
. =
6.02x1023 molec. CO
1
7.96 mol CO
Time to Practice!
Complete WS 1