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Today Unit Conversions with Moles Review “Average Atomic Mass” Worksheet

Today Unit Conversions with Moles Review “Average Atomic Mass” Worksheet. Homework “Unit Conversions with Moles” Worksheet due TUES., 8/28 (so we can discuss) Notecard Quiz on WED., 8/29 Chapter 4 Test on FRI., 8/31 “Chapter 4 Homework Packet” due FRI., 8/31. Mole Unit Conversions.

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Today Unit Conversions with Moles Review “Average Atomic Mass” Worksheet

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  1. Today • Unit Conversions with Moles • Review “Average Atomic Mass” Worksheet • Homework • “Unit Conversions with Moles” Worksheet due TUES., 8/28 (so we can discuss) • Notecard Quiz on WED., 8/29 • Chapter 4 Test on FRI., 8/31 • “Chapter 4 Homework Packet” due FRI., 8/31

  2. Mole Unit Conversions Honors Chemistry

  3. What is a Mole? SI unit for amount of substance is called mole A mole measures the number of particles/atoms/molecules within a substance A mole refers to a specific number of particles (it is a counting unit, similar to a dozen)

  4. 1 mole = 6.02 x 1023 particles/atoms/molecules 6.02 x 1023 is also known as Avogadro’s Number 1 mole magnesium = 6.02 x 1023Mg atoms 1 mole zinc = 6.02 x 1023Zn atoms 1 mole lead = 6.02 x 1023Pb atoms

  5. Molar Mass Although 1 mole always contains the same number of particles(6.02 x 1023), the mass of one mole varies depending on the substance Molar Mass: The mass of onemole of a substance. Mass of one mole of an element is EQUAL to its ATOMIC MASS,which isexpressed in grams. 1 mole of magnesium = 24.31 grams 1 mole of zinc = 65.39 grams 1 mole of lead = 207.2 grams

  6. Mole Conversions • Many times in chemistry, you will need to express a measurement in a unit different from the one given or measured initially • Conversion Factor:Ratio of equivalent measurements used to convert from one unit to another

  7. Mole Grams Molar Mass Mole ⬄ Grams Conversions • To convert between grams and moles, use molar mass as the conversion factor Example #1: mol ⬄ grams — How many grams are in 3.01 mol of iron (Fe)? Example #2:grams ⬄ mol — How many moles are in 75 g of Fe?

  8. Mole ⬄ Grams Conversions: Example Problem Solutions Example #1: mol ⬄ grams — How many grams are in 3.01 mol of iron (Fe)? Example #2:grams ⬄ mol — How many moles are in 75 g of Fe? 75 g Fe x 1 mol Fe = 1.3 mol Fe 55.847 g Fe

  9. Mole ⬄ Particles/Atoms Conversions • To convert between particles/atoms and moles, use Avogadro’s Number (6.02 × 1023) Example #1:particles ⬄ mol — How many moles equal 2.41 × 1024 atoms of aluminum (Al)? Example #2:mol ⬄ particles — How many atoms are in 3.45 mol of Al? Particles Mole Avogadro’s #

  10. Mole ⬄ Particles/Atoms Conversions: Example Problem Solutions Example #1:particles ⬄ mol — How many moles equal 2.41 × 1024 atoms of aluminum (Al)? Example #2:mol ⬄ particles — How many atoms are in 3.45 mol of Al?

  11. Mole Conversion Practice 1.) A student has a 1 mole sample of silver and a 1 mole sample of gold. • Which sample contains the greatest number of atoms? How many atoms are in each sample? • Which sample has the greatest mass? What is the mass of each sample?

  12. Mole Conversion Practice, (cont.) 2.) A chemist produced 11.25 g of magnesium (Mg). How many moles of Mg were produced? 3.) Determine the number of silver (Ag), atoms that are contained in 0.650 mol of Ag.

  13. STOP HERE. DO NOT NEED TO YET KNOW INFO ON SLIDES #14 & #15 FOR CHAPTER 4 TEST ON FRI., 8/31!! 

  14. Particle Mole Avogadro’s # Molar Mass Gram Particles ⬄ Grams Conversions • To convert between particles and grams, use BOTHmolar mass ANDAvogadro’s Number (cannot go directly from particles to grams and vice versa; must first find MOLES) Example #1:particles ⬄ grams — How many grams are in 7.00 × 1033 molecules of H2O? Example #2:grams ⬄ particles — How many molecules are in 8.25 g of H2?

  15. Particles ⬄ Grams Conversions: Example Problem Solutions Example #1:particles ⬄ grams — How many grams are in 7.00 × 1033 molecules of H2O? Example #2:grams ⬄ particles — How many molecules are in 8.25 g of H2?

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