Mole calculations Made Easy

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Mole calculations Made Easy

  1. 1. Mole Calculations<br />Lauren Linenberger<br />Nicole Hanamura<br />Narration by: Alaina Gist<br />
  2. 2. Definition of Mole<br /><ul><li>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.
  3. 3. ‘mole’ is often abbreviated as ‘mol’</li></li></ul><li>Definition of Molar Mass<br /><ul><li>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).
  4. 4. The molar mass of an element can be found on the Periodic table. It is the decimal located below each element’s symbol.
  5. 5. Units: atomic mass unit (amu) or grams per mole (g/mol)</li></li></ul><li>Avogadro’s Number<br /><ul><li>The number of particles in one mole, equal to 6.02214199 × 1023 mol-1 (± 0.00000047 mol-1).
  6. 6. Named for Amedeo Avogadro, </li></ul>an Italian chemist and physicist (1776-1856)<br />
  7. 7. Finding Molar Mass<br /><ul><li>Ex: H2O = 1 mol of Oxygen, 2 mol of Hydrogen
  8. 8. 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
  9. 9. Add the two numbers: </li></ul> 15.9994 + 2.01588 = 18.02 g/mol<br />
  10. 10. Finding Molar Mass Cont.<br /><ul><li>Ex: NaOH = 1 mol of Sodium, 1 mol of Oxygen, 1 mol of Hydrogen
  11. 11. Multiply molar mass of each element by the number of moles of that element in the molecule: 1(22.990) = 22.990</li></ul>1(15.9994) = 15.9994 and 1(1.00794) = 1.00794<br /><ul><li>Add the three numbers: </li></ul> 22.990 + 15.9994 + 1.00794 = 39.99734 g/mol<br />
  12. 12. Mole Analogies<br /><ul><li>1 pair of aces = 2 aces</li></ul>1 dozen apples = 12 apples<br />1 gross atoms = 144 atoms<br /><ul><li>1 mole of aces = 6.02x1023 aces
  13. 13. 1 mole of apples = 6.02x1023 apples
  14. 14. 1 mole of atoms = 6.02x1023atoms</li></li></ul><li>Mole Conversions<br /><ul><li>1 mole = 6.02x10^23 atoms/ions/molecules/formula units
  15. 15. That equals around 602,000,000,000,000,000,000,000 atoms/ions/molecules/formula units!
  16. 16. 1 mole = 22.4 Liters (L) of gas at STP (standard temp. and pressure)
  17. 17. 1 mole = molar mass of element/molecule/compound/etc.</li></li></ul><li>Mole Calculations<br /><ul><li>Converting from grams to moles:</li></ul> ( given mass of ___ ) x (1 mole of ___ ) = ___ moles of ___<br /> ( molar mass of ___ )<br /><ul><li>Converting from atoms/molecules/ions/formula units to moles:</li></ul>( given # of atoms of ___ ) x (1 mole of ___ ) <br /> (6.02x1023 atoms of ___ ) <br /> = ___ moles of ___<br />
  18. 18. Mole Calculations Cont.<br /><ul><li>Converting from liters to moles:</li></ul> <br /> ( given volume in liters of ___ ) x (1 mole of ___ ) (22.4 liters of ___ )<br /> = ___ moles of ___<br /> <br />
  19. 19. Examples of Mole Calculations<br /><ul><li>45 grams N = ? Moles N</li></ul>45 g N 1 mol N = 3.213 moles N<br /> 14.00674 g N<br /><ul><li>23.6 g H2O = ? Molecules H2O</li></ul>23.6 g H2O 1 mol H2O 6.02x1023 molecules H2O<br /> 18 g H2O 1 mol H2O<br /> = 7.89x1023 molecules H2O<br />
  20. 20. Examples of Mole Calculations Cont.<br /><ul><li> 35 L of apple juice = ? moles of apple juice</li></ul> 35 L apple juice 1 mol apple juice<br /> 22.4 L apple juice<br /> = 1.56 mol apple juice<br /><ul><li>.07 moles of NaCl = ? grams NaCl</li></ul> .07 mol NaCl 58.443 g NaCl = 4.091 g NaCl<br /> 1 mol NaCl<br />
  21. 21. “Here, take my number. Of course, it's 6.02 X 10^23.<br /> I'm frickin' Avogadro! Ha! Get it?! It's my number!”<br />
  22. 22. Bibliography<br /><ul><li>"Avogadro Cartoon 1." CSL Cartoon Stock. Web. 16 Mar 2011.</li></ul> <http://www.cartoonstock.com/directory/a/avogadro.asp>.<br /><ul><li>"Glossary." General Chemistry Online. Fred Senese, 15 Febuary 2010. </li></ul> Web. 16 Mar 2011. <http://antoine.frostburg.edu/chem/senese/101/glossary/m.shtml>.<br /><ul><li>Lower, Stephen. "Avogadro's number and the mole." General Chemistry</li></ul> Virtual Textbook. Creative Commons Attribution 3.0 Unported<br /><ul><li>License, 15 febuary 2011. Web. 16 Mar 2011. <http://www.chem1.com/acad/webtext/intro/MOL.html>.
  23. 23. Mole." Dreamstime. Web. 16 Mar 2011. <http://thumbs.dreamstime.com/thumblarge_493/12705563261c81F9.jpg>
  24. 24. "Moles." Allstate Animal Control. Web. 16 Mar 2011. <http://allstateanimalcontrol.com/images/large%20images/moleBig.jpg>.</li>

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