Atomic Mass.pptx - Atomic Mass Avogadro’s Number Molar Mass of an element Atomic Mass Atomic weight(mass of an element is average of the masses(in amu

Atomic Mass.pptx - Atomic Mass Avogadro’s Number Molar...

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Atomic Mass Avogadro’s Number Molar Mass of an element
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Atomic Mass Atomic weight (mass): of an element is average of the masses (in amu) of its isotopes found on the Earth. Cl 17 35.45 Atomic number Atomic weight
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Counting atoms by weighing Jelly Bean (g) Mint (g) 3.01 1.03 2.89 1.50 3.20 1.30 3.10 1.30 2.95 1.20 2.97 1.10 3.02 1.25 3.05 1.30 2.99 1.43 2.91 1.15 3.01 1.26 Often it is useful to count the number of items by weighing them instead. How many Jelly beans in 60.2 g? How many Mint tic tac in 44.1 g?
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Counting atoms by weighing 5.03 10 30 amu Cl = ? Atoms of Cl 1 Chlorine atom = 35.45 amu 5.03 10 30 amu Cl 1 Cl atom 35.45 amu Cl = 1.42 10 29 atoms Cl Atomic mass (weight) Number of atoms
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Mole Mole: formula weight of a substance (in gram). 12g of C = 1 mol C 23g of Na = 1 mol Na 58.5 g of NaCl = 1 mol NaCl 18 g of H 2 O = 1 mol of H 2 O
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7 A mole contains 6.02 x 10 23 particles (atoms, ions, molecules, formula unit) The number 6.02 x 10 23 is known as Avogadro’s number . One mole of any element contains Avogadro’s number of atoms.
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