Units - Units Units • • • • • Dozen = 12 items...

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Unformatted text preview: Units Units • • • • • Dozen = 12 items Dozen Gross = 144 items Gross Mole of C = 12 g C-12 Mole Mole of O = 16 g O Mole Mole of ? = AW g of ? Mole Mole Mole • Mole = 6.02214 x 1023 atoms – Avogadro’s Number – mol = # of C-12 atoms in exactly 12 grams of mol pure C-12 C-12 – 1 mole of an element mole = that elements atomic mass mass Mole Mole • How large is that number??? Mole Mole • How large is that number??? • Travel along a mole of hydrogen atoms (6.022 • 10 23 10−10 m 13 atoms) = 6.022 • 10 m atom Mole Mole • Travel along a mole of hydrogen atoms 10−10 m 23 13 (6.022 • 10 atoms) = 6.022 • 10 m atom 1km mi (6.022 • 10 m) = 3.74 x1010 mi 1000m 1.609km 13 3.74 billion miles!!! Avogadro’s Number Avogadro’s Amount of water in world’s oceans (liters) Age of Earth in seconds Population of earth 602,200,000,000,000,000,000,000 Average college tuition Distance from earth to sun (cm) Avogadro’s Number in Calculations Avogadro’s • Calculate the mass of 500 atoms of iron Calculate (Fe). (Fe). Avogadro’s Number in Calculations Avogadro’s • Calculate the mass of 500 atoms of iron Calculate (Fe). (Fe). • Atomic mass of Fe = 55.85 g/mol Avogadro’s Number in Calculations Avogadro’s • Calculate the mass of 500 atoms of iron Calculate (Fe). (Fe). • Atomic mass of Fe = 55.85 g/mol • 500 atoms x 1 mol____ = 8.3029 x 10-22 500 mol mol 6.022 x 1023atoms 6.022 Avogadro’s Number in Calculations Avogadro’s • Calculate the mass of 500 atoms of iron Calculate (Fe). (Fe). • Atomic mass of Fe = 55.85 g/mol • 500 atoms x 1 mol____ = 8.3029 x 10-22 500 mol mol 6.022 x 1023atoms 6.022 8.3029 x 10-22 mol x 55.85 g_ = 4.63716 x 8.3029 4.63716 10-20 g 10 Avogadro’s Number in Calculations Avogadro’s • Calculate the mass of 500 atoms of iron Calculate (Fe). (Fe). • Atomic mass of Fe = 55.85 g/mol 8.3029 x 10-22 mol x 55.85 g_ = 4.63716 x 8.3029 4.63716 10-20 g 10 1 mol mol Rounds to 4.64 x 10-20 g Self Learning Self • Click here for information on Avogadro’s Click here number number • Click here for a practice quiz Click here ...
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