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Understanding the Mole Concept in Chemistry

Learn how the mole is used to measure substances, convert moles to particles, and understand Avogadro's number. Discover how to calculate atoms and molecules in moles easily.

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Understanding the Mole Concept in Chemistry

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  1. Chemistry 1Notes #5Chapter 11 Section 1THE MOLE& particle calculations Last updated June 10, 2014

  2. MOLEs • Moles • Moles • Moles • Moles • Moles • Moles • Moles

  3. Measuring Matter • What is a mole? • The Mole is an SI base unit for the amount of a substance. • Saying there is a mole of something is just like saying there is a dozen of something. The mole represents the number of atoms, particles, or molecules just like a dozen represents twelve of something.

  4. Whereas a dozen is known as 12 of something, a pair is always 2, and a gross is always 144. This number never changes but what is counted does. • The same can be said about the mole

  5. The mole represents 6.02x1023 of something. • This number is called Avogadro’s number • In chemistry the mole is used to measure how many atoms, particles or molecules something contains

  6. Converting Moles to Particles and Vice versa • Using the mole and knowing how many particles, atoms or molecules, converting from the mole to how many particles and back is simple • Problem: How many atoms are in 1.76 mol of Zn

  7. Solution:

  8. Problem 2 • How many mol are in 2.33x1027 particles of Carbon? Actual answer 3870 mol C or 3.87 x 103 mol C

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