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So what unit do chemists use to count particles?

So what unit do chemists use to count particles? Particles are so tiny, chemists use the unit of moles. A mole contains 6.02 x 10 23 atoms. 602, 000, 000, 000, 000, 000, 000, 000. 602,000,000,000,000,000,000,000.

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So what unit do chemists use to count particles?

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  1. So what unit do chemists use to count particles? Particles are so tiny, chemists use the unit of moles. A mole contains 6.02 x 1023 atoms. 602, 000, 000, 000, 000, 000, 000, 000

  2. 602,000,000,000,000,000,000,000 • One mole of popcorn would cover every dry surface of the Earth to a depth of six miles • One mole of stacked pennies would reach to the moon and back 16 times • One mole of marshmallows would cover the US to a depth of 650 miles

  3. 1811- Avogadro- equal volumes of gases at the same temperature and pressure contained equal number of molecules • 1861- Cannizzaro- developed atomic weights for known elements • 1865- Loschmidt- determined the number of atoms present in given volume of air • 1971- true value 6.02 x 1023 found

  4. Recall the Law of Conservation of Mass Mass of reactants = mass of products Mass of starting substances = mass of ending substances 2 hydrogen atoms + 1 oxygen atom  1 water molecule

  5. Law of Definite Proportions • Regardless of amount, a compound will always be composed of the same elements in the same proportions by mass • For example, two hydrogen atoms will always combine with one oxygen atom to produce one molecule of water

  6. x 6.02 x 1023 Moles Particles Atoms, molecules ÷ 6.02 x 1023 Moles ↔ Particles Conversion

  7. Convert 3.5 moles to atoms

  8. Convert 18.06x1023 atoms to moles

  9. Convert from moles to particles • 2.7 moles of lithium • 1.8 moles of sodium chloride

  10. Convert from moles to particles • 5.3 moles of bromine • 4.7 moles of potassium oxide

  11. particles  moles • 4.32 x 1024 atoms of calcium

  12. particles  moles • 2.7 x 1020 atoms of copper

  13. particles  moles • 2.5 x 1024 molecules of sodium chloride • 5.32 x 1023 molecules of calcium chloride

  14. You try these… • 25 moles to particles • 4.08 x 104 particles to moles • 0.002 moles to particles • 2.3 x 1016 particles

  15. Moles to particles 2.7 moles 1.8 moles 5.3 moles 4.7 moles Particles to moles 4.32 X 1024 2.70 X 1020 2.50 X 1024 5.32 X 1023 HomeworkComplete on another sheet of paper showing your work!

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