More about moles!. Chemical Formulas and the Mole Aluminum oxide (Al 2 O 3 ) is the raw material...

More about moles!

Chemical Formulas and the Mole

Aluminum oxide (Al2O3) is the raw material from which we get aluminum.

How many moles of aluminum ions (Al3+) are in 1.25 moles of aluminum oxide?


1.25 moles Al2O3


2 moles Al3+

1.25 moles Al2O3 X --------------------

1 mole Al2O3


2 moles Al3+

1.25 moles Al2O3 X --------------------

1 mole Al2O3

= 2.50 moles Al3+

Molar Mass of Compounds

What is the mass of 1 mole of Al2O3?



2 moles Al

3 moles O



2 moles Al x 27.0 g/mole

3 moles O x 16.0 g/mole



2 moles Al x 27.0 g/mole = 54.0 g

3 moles O x 16.0 g/mole = 48.0 g





----------

102.0 g





----------

102 g

Converting Moles to Mass

What is the mass of 1.25 moles Al2O3?



2.50 moles Al

3.75 moles O



2.50 moles Al x 27.0 g/mole

3.75 moles O x 16.0 g/mole



2.50 moles Al x 27.0 g/mole = 67.5 g

3.75 moles O x 16.0 g/mole = 60.0 g



2.50 moles Al x 27.0 g/mole = 67.5 g

3.75 moles O x 16.0 g/mole = 60.0 g

----------

127.5 g



2.50 moles Al x 27.0 g/mole = 67.5 g

3.75 moles O x 16.0 g/mole = 60.0 g

----------

127 g

Homework: Problems 20-29 on pages 321-323.

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More about moles!. Chemical Formulas and the Mole Aluminum oxide (Al 2 O 3 ) is the raw material...

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