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A DOZEN roses = 12 roses

A DOZEN roses = 12 roses. A PAIR of shoes = 2 shoes. a DOZEN eggs = 12 eggs. a REAM of paper = 500 sheets. A GROSS of pencils = 144 pencils. A SIX –PACK of beer = 6 cans. TRIO. QUARTET.

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A DOZEN roses = 12 roses

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  1. A DOZEN roses = 12 roses

  2. A PAIR of shoes = 2 shoes

  3. a DOZEN eggs = 12 eggs

  4. a REAM of paper = 500 sheets

  5. A GROSS of pencils = 144 pencils

  6. A SIX –PACK of beer = 6 cans

  7. TRIO

  8. QUARTET

  9. When you have a dozen of something, no matter what you are talking about, you have12 of that thing. • A dozen donuts- a dozen eggs • a dozen cars, • a dozen chemistry problems are all 12 of that material.

  10. The mole is the exact same concept. • You can have: • a mole of eggs • a mole of donuts • a mole of cars • a mole of chemistry problems. However a mole is MUCH bigger than 12 ...it is 602 sextillion. Obviously a mole of chemistry problems is way too many problems.

  11. The mole is typically used for counting or grouping very very small things, like atoms

  12. a MOLE (mol) 1. The mole is an SI unit that allows us to count # of: • Atoms • molecules • formula units • without actually seeing them Representative particles

  13. 2. 1 mol = 6.02 x 1023 representative particles 3. The number is called “Avogadro’s number” in honor of the Italian scientist Amadeo Avogadro

  14. Avogadro’s number 1 mole of anything=6.02 x 1023 Atoms or Molecules or FUNs

  15. MOLE DAY

  16. 4. REPRESENTETIVE particles: • ATOMs (elements on the PT) 2. MOLECULES (_______compounds – all elements are non metals) EX: CO2, NO2, C12H22O11 covalent 3. Formula Units(_____compounds – at leastone element must be a metal) EX: NaCl, CuCl2, FeO ionic

  17. A DOZEN MASS of a dozen limes = MASS of a dozen cars

  18. A MOLE CARBON COPPER MASS of a mole carbon = MASS of a mole copper 6.02 x 1023 Catoms = 6.02 x1023 Cu atoms

  19. HOW DO YOU DETERMINE THE MASS OF A MOLE ?

  20. MOLAR MASS – the mass of 1 mole of any pure substance (element and compound) Molar Mass (MM) = Atomic mass (AM) • MM units - g/mol • AM - Atomic Mass units - amu (atomic mass units) EX: Mn - 54.94 amu = 54.94 g/mol

  21. EXAMPLES: • 1 mole of Al : AM 26.98 g = MM 26.98 g/mol # of atoms = # of moles 2. 1 mole of CO2: AM (C) = 12.011 amu = MM AM (O) = 16.00 amu x 2 = MM 12.011 + 2 (16.00) = 44.01 g/mole

  22. 3. 1 mole of Cu(NO2)2: AM (Cu) 63.546 amu = MM g/mole AM (N) 14 x 2 amu = MM g/mole AM (O) 16 x 4 amu = MM g/mole 63.546 + 2(14) + 4 (16) = 155.5 g/mole

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