MOLE

The Mole

Year 11

​The Mole

Using mass spectrometer, it was determined that the mass of one carbon-12 atom is

1.933 x 10^-23g​

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So in 12g of carbon (relative atomic mass of C is 12), there are 6.022 x 10²³ atoms= 1 MOLE.

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​Facts on The Mole

• 1 mole= 6.022 x 10²³ atoms

• The mole can either be a mass or a number of particles

• ​Abbreviation is 'mol'

• ​Commonly used term is molar mass = mass of one mole of a substance

  • has the units of g/mol or g.mol^-1

• We can easily convert between mass, moles, and particles

• We can also easily calcul​ate mass, molar mass, or moles (as long as we have two of these numbers)

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​Calculating moles, given mass (or inverse)

Fill in the Blanks

Calculate the number of moles in 2.46g of sodium sulfate Na2S04. Write your answer in 4 decimal places

Fill in the Blanks

Calculate the mass of 34.2 moles of calcium carbonate, CaCO3.

Calculating number of particles, given ​moles (or inverse)

Counting Atoms

A Chemist's Dozen

1 mole = 6.022 x 10²³ particles

• 1 dozen = 12 objects

• 1 score = 20 objects

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• The MOLE

  • 1 mole equals the amount of substance that contains 6.0221421 x 10²³ particles

Avogadro's Number & Molar Mass

​The mass of one mole of a substance is called Molar Mass (MM)

• Units are g​/mol

• In an element 1 mole is equal to its Atomic Mass​

Molar Mass

1 mole of atoms of any element will have a mass equal to its relative Atomic Mass

• Its shown in grams​

​Once Again

​1 Mol = 23 grams

2 Mol =

3 Mol =

​Examples

How many grams are in 2 mol of Carbon (C)?

1. Look for the element

2. Look at the atomic mass

3. multiply the mol they are asking for​

Multiple Choice

How many particles are found in a mole?

• $$6.022\ x\ 10^{23}$$  

• $$6.022\ x\ 1023$$  

• $$6022\ x\ 10^{23}$$  

• $$6022\ x\ 1023$$  

Multiple Choice

What are the units used for Molar Mass

• grams

• mols

• g/mol

• mol/g

Multiple Choice

How many grams are in 3 mol of carbon?

• 6 grams

• 12 grams

• 18 grams

• 36 grams

Multiple Choice

How many grams are in 1 mole of Mg?

• 12 grams

• 24 grams

• 36 grams

• 6.022 x 10²³ grams