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The Mole and Molar Mass

The Mole and Molar Mass. Remember: 1 mole = 6.02 x 10 23 particles The mass on the periodic table is correct for one atom in a.m.u. AND for 1 mole of that element in grams 6.02 x 10 23 is the number of atoms contained in the atomic masses of each element on the periodic table

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The Mole and Molar Mass

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  1. The Mole and Molar Mass

  2. Remember: 1 mole = 6.02 x 1023 particles • The mass on the periodic table is correct for one atom in a.m.u. AND for 1 mole of that element in grams • 6.02 x 1023 is the number of atoms contained in the atomic masses of each element on the periodic table • Ex: 1 mole oxygen = 6.02 x 1023 particles of O = 16.00 g of oxygen

  3. Realize that a mole refers to the number of particles, not a mass. • A mole of sulfur then will have a different mass than a mole of Lead. • Since their atoms have difference sizes and masses, the overall masses can vary greatly.

  4. Think about the Dozen… Which dozen eggs will have the greatest mass? They all have the same number of eggs! Albatross Chicken Robin Chicken Ostrich Emu

  5. MolarMass Molar Mass:The mass in grams of 1 mol of a substance. This is equal to the atomic mass (amu) of the element Symbol: M Units: ( g / mol ) (grams/mole)

  6. Ex: Determine the molar mass of H2O • MH2O = 2(M for H) + (M of O) = 2(1.01 g/mol) + (16.00 g/mol) = 18.02 g/mol Ex: Determine the molar mass of Ca(NO3)2 • MCa(NO3)2 = (M of Ca) + 2(M of N) + 6(M of O) = (40.08 g/mol) + 2(14.01 g/mol) + 6(16.00 g/mol) = 164.10 g/mol

  7. Your new best friend… • The Mole formula! Be able to rearrange it to solve for each of the variables! n = m M mass (g) Number of moles (mol) Molar mass (g/mol)

  8. Practice …

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