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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?
Chemical Formulas and the Mole
1.25 moles Al2O3
Chemical Formulas and the Mole
2 moles Al3+
1.25 moles Al2O3 X --------------------
1 mole Al2O3
Chemical Formulas and the Mole
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?
Molar Mass of Compounds
What is the mass of 1 mole of Al2O3?
2 moles Al
3 moles O
Molar Mass of Compounds
What is the mass of 1 mole of Al2O3?
2 moles Al x 27.0 g/mole
3 moles O x 16.0 g/mole
Molar Mass of Compounds
What is the mass of 1 mole of Al2O3?
2 moles Al x 27.0 g/mole = 54.0 g
3 moles O x 16.0 g/mole = 48.0 g
Molar Mass of Compounds
What is the mass of 1 mole of Al2O3?
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
Molar Mass of Compounds
What is the mass of 1 mole of Al2O3?
2 moles Al x 27.0 g/mole = 54.0 g
3 moles O x 16.0 g/mole = 48.0 g
----------
102 g
Converting Moles to Mass
What is the mass of 1.25 moles Al2O3?
Converting Moles to Mass
What is the mass of 1.25 moles Al2O3?
2.50 moles Al
3.75 moles O
Converting Moles to Mass
What is the mass of 1.25 moles Al2O3?
2.50 moles Al x 27.0 g/mole
3.75 moles O x 16.0 g/mole
Converting Moles to Mass
What is the mass of 1.25 moles Al2O3?
2.50 moles Al x 27.0 g/mole = 67.5 g
3.75 moles O x 16.0 g/mole = 60.0 g
Converting Moles to Mass
What is the mass of 1.25 moles Al2O3?
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
Converting Moles to Mass
What is the mass of 1.25 moles Al2O3?
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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