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The mole

The mole. A cool unit of chem counting. Representative particles. A representative particle is thought of as the smallest unit into which a substance may be divided without changing its composition For elements the rep. particle is the atom For compounds the rep particle is the formula unit

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The mole

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  1. The mole A cool unit of chem counting

  2. Representative particles • A representative particle is thought of as the smallest unit into which a substance may be divided without changing its composition • For elements the rep. particle is the atom • For compounds the rep particle is the formula unit • For molecular compounds the rep particle is the molecule

  3. Avagadro’s number • A mole is the chemistry unit we use for the amount • 1 mole of ANYTHING is 6.02 x 1023 formula units • A formula unit is the smallest unit of an ionic substance • We can count units of substance this way • 1 mole of pencils has 6.02 x 1023 pencils in it

  4. A mole of water has 6.02 x 1023 molecules of water • Since water has 3 atoms, we would have 3 x (6.02 x 1023 ) atoms • In your notes – show how to PROVE this

  5. Practice time • How many atoms in • 2.06 moles carbon • 0.15 moles of oxygen • 17.25 moles of sugar

  6. How many moles in • 100 atoms of tin • 1.47 x 1045 molecules of carbon dioxide

  7. We can’t count out atoms for reactions • We have to use a balance to weigh out substances, we will use a unit called molar mass (grams / mole)

  8. Molar mass is the mass of one mole of a substance, regardless of the formula unit • Carbon has a molar mass of 12 g/mole • Carbon dioxide 44 g/mol • How did we do it, prove it

  9. Practice • What is the molar mass of • Glucose C6H12O6 • Sodium chloride NaCl • (NH3)PO3 Ammonium phosphite

  10. Practice • How many moles are in • 15 grams of carbon • 105 grams of sodium • 0.147 grams of hydrogen

  11. Practice • How many grams are in • 1 mole of boron • 0.75 mole of sulfur • 743 moles of titanium

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