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Section 1: Measuring Matter

Section 1: Measuring Matter. Chemical Composition. Learning Goals. Explain how a mole is used to indirectly count the number of particles of matter. Relate the mole to a common everyday counting unit. Convert between moles and number of representative particles. Counting Particles.

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Section 1: Measuring Matter

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  1. Section 1: Measuring Matter Chemical Composition

  2. Learning Goals • Explain how a mole is used to indirectly count the number of particles of matter. • Relate the mole to a common everyday counting unit. • Convert between moles and number of representative particles.

  3. Counting Particles • Chemists need a convenient method for accurately counting the number of atoms, molecules, or formula units of a substance. • The mole is the SI base unit used to measure the amount of a substance.

  4. Counting Particles • 1 mole is the amount of atoms in 12 g of pure carbon-12, or 6.02 x 1023 representative particles • an atom, a molecule, a formula unit, an electron, an ion, etc. • The number is called Avogadro’s number.

  5. That’s a lot…

  6. Converting Between Moles and Particles • Moles to particles:

  7. Converting Between Moles and Particles • Particles to moles

  8. Practice • Determine the number of Zn atoms in 2.50 mol of Zn.

  9. Practice • Calculate the number of molecules in 11.5 mol of water.

  10. Practice • How many moles are in 5.75 x 1024 atoms of aluminum?

  11. Practice • How many molecules of AgNO3 are there in 3.25 mol of AgNO3? How many atoms are there?

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