today
DESCRIPTION
Today. You will need a calculator! Go get it. Counting Atoms. What are some ways that we make it easier to count groups of things?. Atoms and molecules are tiny. Counting groups is a pain in the back. - PowerPoint PPT PresentationTRANSCRIPT
Today
You will need a calculator! Go get it
Counting Atoms
What are some ways that we make it easier to count groups of things?
Atoms and molecules are tiny...Counting groups is a pain in the back.
18 grams of water contain 602 000 000 000 000 000 000 000 molecules (more or less...)
How can we make this easier?
1 mole = 6.023 x 1023 items
We still don’t want to count the things!
The mass of one mole is the MOLAR MASS
1 mole of iron = 602 000 000 000
000 000 000 000 atoms= 55.85 grams
Posters around the room...Lists of Elements and Compounds,
with their Molar MassI did NOT give any hint as to how I
found the molar mass.You know how to look up mass on
the periodic table for each atom.You have 5 minutes to look at the
posters and figure out what you would need to do.
Oxygen O2
32.00 grams/mole
Water H2O
18.02 grams/mole
Calcium chlorideCaCl2
110.98 grams/mole
Sodium chlorideNaCl
58.44 grams/mole
Fluorine gasF2
38.00 grams/mole
Sulfur S8
256.56 grams/mole
Baking SodaNaHCO3
56.54 grams/mole
Potassium permanganate
KMnO4
158.04 grams/mole
It seemed that...