1 / 19

THE MOLE

THE MOLE. What a fun concept. WHAT IS A MOLE?. A burrowing critter? A skin pigmentation? A word that evokes an enormous number? 1 mole of any substance equals 6.02 x 10 23 representative particles of that substance 6.02 x 10 23 is known as Avogadro’s number.

corbin
Télécharger la présentation

THE MOLE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. THE MOLE What a fun concept

  2. WHAT IS A MOLE? • A burrowing critter? • A skin pigmentation? • A word that evokes an enormous number? • 1 mole of any substance equals 6.02 x 1023 representative particles of that substance • 6.02 x 1023 is known as Avogadro’s number

  3. WHAT IS A REPRESENTATIVE PARTICLE? • It depends on what the substance is • What can a substance be? • Element • Anything but the BrINClHOF elements which are diatomic molecules in nature • Molecular compound • Made of two or more nonmetals…includes BrINClHOF elements with their subscripts of 2 • Ionic compound • Made of a metal and a nonmetal or contains a polyatomic ion

  4. A HANDY LITTLE CHART

  5. SO, HERE WE GO… • 1 mol of Fe contains 6.02 x 1023atoms of Fe • 1 mol of Br2 contains 6.02 x 1023molecules of Br2 • 1 mol of NaCl contains 6.02 x 1023formula units of NaCl • 1 mol of SO3 contains 6.02 x 1023molecules of SO3 • 1 mol of Na2O contains 6.02 x 1023formula units of Na2O

  6. AND WE MAKE THAT INFO USEFUL BY WRITING IT AS… • 1 mol Fe 6.02 x 1023atoms Fe • 1 mol of Br2 6.02 x 1023molec Br2 • 1 mol of NaCl 6.02 x 1023fu NaCl • 1 mol of SO3 6.02 x 1023molec SO3 • 1 mol Na2O 6.02 x 1023fu Na2O

  7. OR WE CAN FLIP THEM TO GET… • 6.02 x 1023atoms Fe 1 mol Fe • 6.02 x 1023molec Br2 1 mol of Br2 • 6.02 x 1023fu NaCl 1 mol of NaCl • 6.02 x 1023molec SO3 1 mol of SO3 • 6.02 x 1023fu Na2O 1 mol Na2O

  8. SMALLER BITS? • Only for molecules and formula units • 1 molec Br2 has 2 atoms of Br • 1 fu NaCl has 1 Na1+ ion and 1 Cl1- ion • 1 molec SO3 has 1 S atom and 3 O atoms • 1 fu Na2O has 2 Na1+ ions and 1 O2- ion

  9. MOLAR MASS • The mass of one mole of a substance • Use average atomic masses from the periodic table and round their masses to the hundredths place for consistency • Unit is g/mol • 1 mol Fe = 55.85 g Fe …55.85 g Fe = 1 mol Fe • 1 mol Fe or 55.85 g Fe 55.85 g Fe 1 mol Fe

  10. MOLAR MASS OF A COMPOUND • For a compound, you must calculate the molar mass • Molar Mass of Br2 Br---2 x 79.90 = 159.80 g/mol • 1 mol Br2 or 159.80 g Br2 159.80 g Br2 1 mol Br2

  11. MOLAR MASS OF A COMPOUND • Molar Mass of NaCl Na---1 x 22.99 = 22.99 Cl--- 1 x 35.45 = 35.45 58.44 g/mol • 1 mol NaCl or 58.44 g NaCl 58.44 g NaCl 1 mol NaCl

  12. MOLAR MASS OF A COMPOUND • Molar Mass of SO3 S---1 x 32.06 = 32.06 O---3 x 16.00 = 48.00 80.06 g/mol • 1 mol SO3 or 80.06g SO3 80.06 g SO3 1 mol SO3

  13. MOLAR MASS OF A COMPOUND • Molar Mass of Na2O Na---2 x 22.99 = 45.98 O--- 1 x 16.00 = 16.00 61.98 g/mol • 1 mol Na2O or 61.98 g Na2O 61.98 g Na2O 1 mol Na2O

  14. MOLAR MASS OF A COMPOUND • Molar Mass of Ca(OH)2 Ca---1 x 40.08 = 40.08 O--- 2 x 16.00 = 32.00 H--- 2 x 1.01 = 2.02 74.10 g/mol • 1 mol Ca(OH)2 or 74.10 g Ca(OH)2 74.10 g Ca(OH)2 1 mol Ca(OH)2

  15. MOLAR MASS OF A COMPOUND • Molar Mass of Mg(C2H3O2)2 Mg---1 x 40.08 = 24.31 C--- 4 x 12.00 = 48.00 H--- 6 x 1.01 = 6.06 O--- 4 x 16.00 = 64.00 142.37 g/mol • 1 mol Mg(C2H3O2)2 or 142.37 g Mg(C2H3O2)2 142.37 g Mg(C2H3O2)2 1 mol Mg(C2H3O2)2

  16. ANOTHER HANDY CHART 1 mol

  17. AND NOW, YOU PUT IT ALL TOGETHER • How many atoms of helium are in 4.50 mol of helium? • Is helium an element, molecular compound, or ionic compound? • What is its representative particle? • Use your given information to begin your dimensional analysis or unit conversion…always write a number, unit, and substance 4.50 mol He x 6.02 x 1023 atoms He = 2.71 x 1024 atoms He 1 mol He

  18. SO, HAVE FUN • If a sample of chlorine gas contains 2.97 x 1024 atoms of Cl, how many moles of chlorine gas are there? • Is chlorine gas an element, molecular compound, or ionic compound? • What is its representative particle? • Use your given information to begin your dimensional analysis or unit conversion…always write a number, unit, and substance 2.97 x 1024atoms Clx 1 molec Cl2x 1 mol Cl2 = 2 atoms Cl 6.02 x 1023molec Cl2

  19. PRACTICING • How many sulfide ions are present in 10.0 g of ferric sulfide? • Is ferric sulfide an element, molecular compound, or ionic compound? • What is its representative particle? • Use your given information to begin your dimensional analysis or unit conversion…always write a number, unit, and substance 10.0 g Fe2S3x 1 mol Fe2S3 x 6.02 x 1023 fu Fe2S3x 207.88 g Fe2S3 1 mol Fe2S3 3 ions S2- = 1 fu Fe2S3

More Related