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Mole calculations Made Easy
 

Mole calculations Made Easy

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    Mole calculations Made Easy Mole calculations Made Easy Presentation Transcript

    • Mole Calculations
      Lauren Linenberger
      Nicole Hanamura
      Narration by: Alaina Gist
    • Definition of Mole
      • SI unit for amount of substance, defined as the number of atoms in exactly 12 g of carbon-12. One mole of a molecular compound contains Avogadro's number molecules and has a mass equal to the substance's molecular weight, in grams.
      • ‘mole’ is often abbreviated as ‘mol’
    • Definition of Molar Mass
      • The mass of one mole of a material. For example, the molar mass of H2O is 18.015 g (obtained by adding twice the molar mass of hydrogen to the molar mass of oxygen).
      • The molar mass of an element can be found on the Periodic table. It is the decimal located below each element’s symbol.
      • Units: atomic mass unit (amu) or grams per mole (g/mol)
    • Avogadro’s Number
      • The number of particles in one mole, equal to 6.02214199 × 1023 mol-1 (± 0.00000047 mol-1).
      • Named for Amedeo Avogadro,
      an Italian chemist and physicist (1776-1856)
    • Finding Molar Mass
      • Ex: H2O = 1 mol of Oxygen, 2 mol of Hydrogen
      • Multiply molar mass of each element by the number of moles of that element in the molecule: 1(15.9994) = 15.9994 and 2(1.00794) = 2.01588
      • Add the two numbers:
      15.9994 + 2.01588 = 18.02 g/mol
    • Finding Molar Mass Cont.
      • Ex: NaOH = 1 mol of Sodium, 1 mol of Oxygen, 1 mol of Hydrogen
      • Multiply molar mass of each element by the number of moles of that element in the molecule: 1(22.990) = 22.990
      1(15.9994) = 15.9994 and 1(1.00794) = 1.00794
      • Add the three numbers:
      22.990 + 15.9994 + 1.00794 = 39.99734 g/mol
    • Mole Analogies
      • 1 pair of aces = 2 aces
      1 dozen apples = 12 apples
      1 gross atoms = 144 atoms
      • 1 mole of aces = 6.02x1023 aces
      • 1 mole of apples = 6.02x1023 apples
      • 1 mole of atoms = 6.02x1023atoms
    • Mole Conversions
      • 1 mole = 6.02x10^23 atoms/ions/molecules/formula units
      • That equals around 602,000,000,000,000,000,000,000 atoms/ions/molecules/formula units!
      • 1 mole = 22.4 Liters (L) of gas at STP (standard temp. and pressure)
      • 1 mole = molar mass of element/molecule/compound/etc.
    • Mole Calculations
      • Converting from grams to moles:
      ( given mass of ___ ) x (1 mole of ___ ) = ___ moles of ___
      ( molar mass of ___ )
      • Converting from atoms/molecules/ions/formula units to moles:
      ( given # of atoms of ___ ) x (1 mole of ___ )
      (6.02x1023 atoms of ___ )
      = ___ moles of ___
    • Mole Calculations Cont.
      • Converting from liters to moles:
       
      ( given volume in liters of ___ ) x (1 mole of ___ ) (22.4 liters of ___ )
      = ___ moles of ___
       
    • Examples of Mole Calculations
      • 45 grams N = ? Moles N
      45 g N 1 mol N = 3.213 moles N
      14.00674 g N
      • 23.6 g H2O = ? Molecules H2O
      23.6 g H2O 1 mol H2O 6.02x1023 molecules H2O
      18 g H2O 1 mol H2O
      = 7.89x1023 molecules H2O
    • Examples of Mole Calculations Cont.
      • 35 L of apple juice = ? moles of apple juice
      35 L apple juice 1 mol apple juice
      22.4 L apple juice
      = 1.56 mol apple juice
      • .07 moles of NaCl = ? grams NaCl
      .07 mol NaCl 58.443 g NaCl = 4.091 g NaCl
      1 mol NaCl
    • “Here, take my number. Of course, it's 6.02 X 10^23.
      I'm frickin' Avogadro! Ha! Get it?! It's my number!”
    • Bibliography
      • "Avogadro Cartoon 1." CSL Cartoon Stock. Web. 16 Mar 2011.
      <http://www.cartoonstock.com/directory/a/avogadro.asp>.
      • "Glossary." General Chemistry Online. Fred Senese, 15 Febuary 2010.
      Web. 16 Mar 2011. <http://antoine.frostburg.edu/chem/senese/101/glossary/m.shtml>.
      • Lower, Stephen. "Avogadro's number and the mole." General Chemistry
      Virtual Textbook. Creative Commons Attribution 3.0 Unported
      • License, 15 febuary 2011. Web. 16 Mar 2011. <http://www.chem1.com/acad/webtext/intro/MOL.html>.
      • Mole." Dreamstime. Web. 16 Mar 2011. <http://thumbs.dreamstime.com/thumblarge_493/12705563261c81F9.jpg>
      • "Moles." Allstate Animal Control. Web. 16 Mar 2011. <http://allstateanimalcontrol.com/images/large%20images/moleBig.jpg>.