Moles.

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Presentation transcript:

Moles

What is a Mole? 1 mole = 6.023 x 1023 atoms or molecules 602,300,000,000,000,000,000,000 Avogadro’s number

The AMOUNTS of items are the same, but what is different? The Dozen Analogy The AMOUNTS of items are the same, but what is different? 1 dozen = __________ 1 dozen cotton balls = ___________ cotton balls 1 mole cotton balls = ______________ cotton balls 1 dozen eggs = ___________ eggs 1 mole eggs = ______________ eggs 1 dozen bricks = ___________ bricks 1 mole bricks = ______________ bricks

Moles 1 mole = “molar mass” For an element, the molar mass is equal to the average atomic mass for that element.

Conversion factors for moles To convert between grams, moles, and atoms: 1 mole = 6.023 x 1023 atoms 1 mole = “molar mass” of substance

How many grams of helium are in 2.00 moles of helium?

Practice How many moles is 3.60 grams of carbon?

How many atoms are there in 2.50 mol of copper? Atoms/Moles How many atoms are there in 2.50 mol of copper?

How many moles is 3.012 x 1023 atoms of neon?

Conversion factors for moles To convert between grams, moles, and atoms: 1 mole = 6.023 x 1023 atoms 1 mole = “molar mass” of substance