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Molar Conversions

Molar Conversions. Or Everything is easier with doughnuts & dozens. A step sideways: Working in Dozens. Dozen & particles conversion. Dozen & mass conversion. 1 dozen eggs = 12 eggs 1 dozen doughnuts = 12 doughnuts

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Molar Conversions

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  1. Molar Conversions Or Everything is easier with doughnuts & dozens

  2. A step sideways: Working in Dozens Dozen & particles conversion Dozen & mass conversion • 1 dozen eggs = 12 eggs • 1 dozen doughnuts = 12 doughnuts • Does it matter what the material is when you convert from dozen to particles? • 1 dozen eggs = 698 g • 1 doz doughnuts = 854 g • Why is the mass of a dozen different for each substance? • Are all eggs identical? Are doughnuts identical? Isotope analogy

  3. Some sample 1-step problems Dozen to particle conversion Particle to dozen conversion • If you have 2.3 dozen eggs how many eggs do you have? • If you have 90 doughnuts how many dozen doughnuts do you have?

  4. Some sample 1-step problems Dozen to mass conversion Mass to dozen conversion • If you have 2.3 dozen doughnuts how many grams of doughnuts do you have? • If you have 1750 g of eggs how many dozen eggs do you have?

  5. X 12 X mass of a dozen Dozen Particles Mass ÷ 12 ÷ mass of a dozen

  6. Some sample 2-step problems Mass to particle conversion Particle to mass conversion • If you have 1300 g of doughnuts how many doughnuts do you have? • If you have 225 eggs how many grams of eggs do you have?

  7. X 12 X mass of a dozen Dozen Particles Mass ÷ 12 ÷ mass of a dozen

  8. Try these two problems on your own… • You have 140 g of doughnuts. How many dozen doughnuts do you have? • You have 19 eggs. How many grams of eggs do you have?

  9. Chemistry Units? • So… If you easily work in dozens for doughnuts and eggs, are we going to work with dozens for atoms and molecules? Why or why not? • Should we measure the mass of an atom in grams? Why or why not?

  10. Survey says… • You have 210 g of doughnuts. How many dozen doughnuts do you have? • Ans: You have 0.25 dozen doughnuts • This is a 1-step problem. If you got it wrong, go back and review that section of the video. • You have 19 eggs. How many grams of eggs do you have? • Ans: You have 1100g of eggs • This is a 2-step process. If you got it wrong, go back and review that section of the video.

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