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Ch. 10: The Mole

Ch. 10: The Mole. Sec. 10.1: Measuring Matter. Objectives Describe how a mole is used in chemistry. Relate a mole to common counting units. Convert moles to number of representative particles and vice versa. The Mole.

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Ch. 10: The Mole

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  1. Ch. 10: The Mole

  2. Sec. 10.1: Measuring Matter Objectives • Describe how a mole is used in chemistry. • Relate a mole to common counting units. • Convert moles to number of representative particles and vice versa.

  3. The Mole • In simplest terms, a mole is 6.02 x1023 representative particles of a substance. • A representative particle is the particle, (such as atom, molecule, formula unit, electron or ion) that a substance is found in.

  4. Representative Particle For example, 1 mole of water is 6.02 x 1023molecules of water

  5. Representative Particle One mole of iron is 6.02 x1023 atoms of Fe.

  6. Representative Particle 1 mole of NaCl is 6.02 x 1023formula unitsof NaCl. (Remember, ionic compounds come in formula units.)

  7. Representative Particle l mol of Na ions (Na+) is 6.02 x 1023ions 1 mol Cl ions (Cl-) is 6.02 x 1023ions.

  8. The Mole 6.0221367 x 1023 is called Avogadro’s number in honor of Amedo Avogadro who, in 1811, determined the volume of one mole of a gas.

  9. How big is a mole? • 602 000 000 000 000 000 000 000 • This is an enormous number used to count extremely small particles.

  10. Mole Conversions • 1 mole of anything is 6.02 x 1023 particles of that thing. • Therefore, for any substance, you can convert from the number of moles to the number of particles (and vice versa) using DIMENSIONAL ANALYSIS. • Example: How many atoms are in 2.18 moles of Zn?

  11. Mole Conversions • How many molecules of sucrose are in 4.53 moles of sucrose? • Given 7.69 mol AgNO3, determine the number of formula units.

  12. Mole Conversions What do we do if we want to find out how many moles are represented by a certain number of representative particles?

  13. Mole Conversions • How many moles in 5.75 x 1024 atoms Al? • How many moles in 3.75 x 1024 molecules of CO2? • How many moles in 3.58 x 1023 formula units ZnCl2?

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