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IIIIIIIV The Mole Molar Conversions

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A. What is the Mole? n A counting number (like a dozen) n Avogadro’s number (N A ) n 1 mol = 6.02 10 23 items A large amount!!!!

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This is the fundamental definition of what one mole is: n One mole contains as many “entities” (things) as there are atoms in 12 grams of carbon-12. n One mole of carbon-12 contains 6.02 x 10 23 atoms of carbon-12.

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n 1 mole of hockey pucks would equal the mass of the moon! A. What is the Mole? n 1 mole of pennies would cover the Earth 1/4 mile deep! n 1 mole of basketballs would fill a bag the size of the earth!

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B. Molar Mass n Mass of 1 mole of an element or compound. n Atomic mass tells the... atomic mass units per atom (amu) grams per mole (g/mol)

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B. Molar Mass Examples n carbon n aluminum n zinc 12.01 g/mol 26.98 g/mol 65.39 g/mol

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B. Molar Mass Examples n water n sodium chloride H2OH2O 2(1.01) + 16.00 = 18.02 g/mol NaCl 22.99 + 35.45 = 58.44 g/mol

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B. Molar Mass Examples n sodium bicarbonate n sucrose NaHCO 3 22.99 + 1.01 + 12.01 + 3(16.00) = 84.01 g/mol C 12 H 22 O 11 12(12.01) + 22(1.01) + 11(16.00) = 342.34 g/mol

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Day 2

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C. Molar Conversions molar mass (g/mol) MASS IN GRAMS MOLES NUMBER OF PARTICLES 6.02 10 23 (particles/mol)

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C. Molar Conversion Examples n How many moles of carbon are in 26 g of carbon? 26 g C 1 mol C 12.01 g C = 2.2 mol C

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C. Molar Conversion Examples n How many moles of sodium chloride are in 26 g of sodium chloride? 26 g NaCl 1 mol NaCl 58.44 g NaCl = 0.44 mol NaCl

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C. Molar Conversion Examples n How many moles of magnesium fluoride are in 85 g of MgF 2 ? 85 g MgF 2 1 mol MgF 2 62.31 g MgF 2 = 1.36 mol MgF 2

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Day 3

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C. Molar Conversions molar mass (g/mol) MASS IN GRAMS MOLES NUMBER OF PARTICLES 6.02 10 23 (particles/mol)

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C. Molar Conversion Examples n How many molecules are in 2.50 moles of C 12 H 22 O 11 ? 2.50 mol 6.02 10 23 molecules 1 mol = 1.51 10 24 molecules C 12 H 22 O 11

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C. Molar Conversion Examples n How many molecules are in 2.50 moles of C 2 H 6 ? 2.50 mol 6.02 10 23 molecules 1 mol = 1.51 10 24 molecules C 2 H 6

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Day 4

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C. Molar Conversion Examples n Find the mass of 2.1 10 24 molecules of NaHCO 3. 2.1 10 24 molecules 1 mol 6.02 10 23 molecules = 290 g NaHCO 3 84.01 g 1 mol

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C. Molar Conversion Examples n How many atoms are in 10 grams of NaCl. 10 g NaCl 1 mol 58.44 g NaCl = 1.03x 10 23 atoms NaCl 6.02 10 23 atoms NaCl 1 mol

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MOLE DAY FUNNIES n Q: What did Avogadro teach his students in math class? n Moletiplication

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Q: What kind of fruit did Avogadro eat in the summer? n A: Watermolens

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Why was there only one Avogadro? nWnWhen they made him, they broke the Moled

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What did Avogadro invent for his wife to use as a night cream? Oil of Molay

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