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The Mole

The Mole. Background. When you buy eggs you usually ask for a _______ eggs. You know that one dozen of any item is ______. Dozen. 12. Paper. Paper is packaged by a ream. A ream of paper has 500 sheets. Why is it useful to use units like a dozen or a ream?. Homework.

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The Mole

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  1. The Mole

  2. Background • When you buy eggs you usually ask for a _______ eggs. • You know that one dozen of any item is ______. Dozen 12

  3. Paper • Paper is packaged by a ream. • A ream of paper has 500 sheets. • Why is it useful to use units like a dozen or a ream?

  4. Homework • 1. In 14.9cm, how many sheets of paper is this? • 2. In 37 000 sheets, how many cm? • 3. In 0.01cm, how many sheets? • 4. How thick is one sheet of paper?

  5. What determines how many items should make up a particular unit?

  6. Counting atoms • Atoms are VERY small • How do you quantify such a small substance • Mole: exactly 12 grams of carbon-12 • Molar mass: mass in grams of one mole of an element • Carbon -12 = 12 grams

  7. Counting atoms • 1 mole of any substance posses 6.022 x 1023 particles • This number Is Avagadro’s Number

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