The Mole.

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Presentation transcript:

The Mole

(We may buy a dozen eggs. A chemist may use a mole of carbon) The Mole is... A SI unit A counting unit (like a dozen) (We may buy a dozen eggs. A chemist may use a mole of carbon) The amount of substance that contains as many particles as there are atoms in 12 g of carbon-12

Avogadro’s Number is… The number of particles (atoms) in a mole 6.022 x 1023 If everyone living worked to count the atoms in one mole, it would take 4 million years! The mole can also be said to be the amount of substance that contains Avogadro’s number of particles.

Molar Mass is… The mass of one mole of a substance Written in g/mol ٭Molar mass is the same as the atomic mass number and is used as a conversion factor

Molar Mass Calculations Divide by 6.022 x 1023 molecules/mol atoms/mol particles/mol Multiply by molar mass g/mol Atoms, molecules, or particles Mass grams Moles Multiply by 6.022 x 1023 molecules/mol atoms/mol particles/mol Divide by molar mass g/mol

Got Mole Problems? Call Avagadro! 602-1023

Example # 1 What is the mass in g of 3.50 mol of Copper?

Example #2 A chemist produces 11.9 g of Al. How many moles of Al are produced?

Example #3 How many moles of Ag are in 3.01 x 1023 atoms of Ag?

Example #4 What is the mass in grams of 1.20 x 108 atoms of Cu?

In-class Practice Problems What is the mass in g of 2.25 mol of Fe? How many moles of Ca are in 5.00 g of Ca? How many moles of Pb are in 1.50 x 1012 atoms Pb? What is the mass in grams of 7.5 x 1015 atoms of Ni?