Today You will need a calculator! Go get it. Counting Atoms.

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Presentation transcript:

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 molecules (more or less...) How can we make this easier?

1 mole = x items

We still don’t want to count the things! The mass of one mole is the MOLAR MASS 1 mole of iron = atoms = grams

Posters around the room... Lists of Elements and Compounds, with their Molar Mass I 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.

OxygenO grams/mole

WaterH 2 O grams/mole

Calcium chloride CaCl grams/mole

Sodium chloride NaCl grams/mole

Fluorine gasF grams/mole

SulfurS grams/mole

Baking Soda NaHCO grams/mole

Potassium permanganate KMnO grams/mole

It seemed that...