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More about moles!. Chemical Formulas and the Mole Aluminum oxide (Al 2 O 3 ) is the raw material from which we get aluminum. How many moles of aluminum.

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Presentation on theme: "More about moles!. Chemical Formulas and the Mole Aluminum oxide (Al 2 O 3 ) is the raw material from which we get aluminum. How many moles of aluminum."— Presentation transcript:

1 More about moles!

2 Chemical Formulas and the Mole Aluminum oxide (Al 2 O 3 ) is the raw material from which we get aluminum. How many moles of aluminum ions (Al 3+ ) are in 1.25 moles of aluminum oxide?

3 Chemical Formulas and the Mole 1.25 moles Al 2 O 3

4 Chemical Formulas and the Mole 2 moles Al 3+ 1.25 moles Al 2 O 3 X -------------------- 1 mole Al 2 O 3

5 Chemical Formulas and the Mole 2 moles Al 3+ 1.25 moles Al 2 O 3 X -------------------- 1 mole Al 2 O 3 = 2.50 moles Al 3+

6 Molar Mass of Compounds What is the mass of 1 mole of Al 2 O 3 ?

7 Molar Mass of Compounds What is the mass of 1 mole of Al 2 O 3 ? 2 moles Al 3 moles O

8 Molar Mass of Compounds What is the mass of 1 mole of Al 2 O 3 ? 2 moles Al x 27.0 g/mole 3 moles O x 16.0 g/mole

9 Molar Mass of Compounds What is the mass of 1 mole of Al 2 O 3 ? 2 moles Al x 27.0 g/mole = 54.0 g 3 moles O x 16.0 g/mole = 48.0 g

10 Molar Mass of Compounds What is the mass of 1 mole of Al 2 O 3 ? 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

11 Molar Mass of Compounds What is the mass of 1 mole of Al 2 O 3 ? 2 moles Al x 27.0 g/mole = 54.0 g 3 moles O x 16.0 g/mole = 48.0 g ---------- 102 g

12 Converting Moles to Mass What is the mass of 1.25 moles Al 2 O 3 ?

13 Converting Moles to Mass What is the mass of 1.25 moles Al 2 O 3 ? 2.50 moles Al 3.75 moles O

14 Converting Moles to Mass What is the mass of 1.25 moles Al 2 O 3 ? 2.50 moles Al x 27.0 g/mole 3.75 moles O x 16.0 g/mole

15 Converting Moles to Mass What is the mass of 1.25 moles Al 2 O 3 ? 2.50 moles Al x 27.0 g/mole = 67.5 g 3.75 moles O x 16.0 g/mole = 60.0 g

16 Converting Moles to Mass What is the mass of 1.25 moles Al 2 O 3 ? 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

17 Converting Moles to Mass What is the mass of 1.25 moles Al 2 O 3 ? 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

18 Homework: Problems 20-29 on pages 321-323. There will be a quiz tomorrow with exactly these kinds of problems. Work on them now. Get stuck now. Let me help you out now.

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