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WEL COME

WEL COME. t o. STOICHI O METRY. Expected Outcomes. STOICHI O METRY. Define it!. stoi·chi·om·e·try [ stòykee ómmətree ] T he branch of chemistry concerned with measuring the proportions of elements that combine during chemical reactions

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WEL COME

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  1. WELCOME to STOICHIOMETRY

  2. Expected Outcomes

  3. STOICHIOMETRY Define it! stoi·chi·om·e·try [stòykeeómmətree] The branch of chemistry concerned with measuring the proportions of elements that combine during chemical reactions Quantitative study of reactants and products that take part in a chemical reaction

  4. STOICHIOMETRY More!

  5. STOICHIOMETRY Imagine 10 g butyric acid CH3CH2CH2-COOH Ethyl butyrate CH3CH2CH2COOCH2CH3

  6. What to expect? Given : Amount of reactants Question:how much of products can be formed. Example 2 A + 2B --------> 3C Given 20.0 grams of A and sufficient B, how many grams of C can be produced?

  7. How can we measure HOW MUCH? You can measure mass, or volume, or you can count pieces. We measure mass in grams. We measure volume in liters. We count piecesin… MOLES

  8. MOLE t h e CONCEPT

  9. MOLE t h e CONCEPT

  10. One mole of a substance contains the same number of molecules/atoms as in 12 grams of carbon-12. This number (of atoms or molecules) is known as the Avogadro constant (NA) which is equal to 6.02 x 1023 MOLE 6.02 x 1023 Carbon 12 atoms 12 grams 1Mole

  11. t h e MOLE CONCEPT

  12. How big is 6 x 1023? Imagine the whole of the United states You are here!

  13. How big is 6 x 1023? Imagine the whole of the United states covered in unpopped popcorn

  14. How big is 6 x 1023? Imagine the whole of the United states covered in unpopped popcorn to a depth of six miles!

  15. How big is 6 x 1023? Imagine the whole of the United states covered in unpopped popcorn to a depth of six miles! Count the grains and that is 6 x 1023! 600000000000000000000000

  16. MOLE More about…

  17. MOLE CONCEPT

  18. Let’s Practice...

  19. Let’s Practice...

  20. More about… MOLE

  21. Homework

  22. Coming up next… Calculating Average Atomic Masses

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