PPT-The Mole Concept Avogadro’s Number = 6.022 x 10

23 How do you measure how much You can measure mass or volume or you can count pieces We measure mass in grams We measure volume in liters We count pieces in MOLES Counting Counting words are used to simplify a description of a number of items . A Chemist’s “Dozen”. http://www.ccs.k12.in.us/chsteachers/VKundrat/MOLE_DAY_EXPLOD%5B1%5D.gif. The Mole. The particles that make up matter (ions, atoms, and molecules) are . extremely small. Only large amounts of these particles can be weighed. In order to simplify these large numbers we use . “A Chemists Dozen”. The Mole – A Chemists Dozen. 1 dozen = . 12 items. 1 six-pack = . 1 hour = . 1 dollar =. 1 mole = . 602,000,000,000,000,000,000,000 entities. Because atoms and molecules are so small, chemists established their own counting unit – the mole. A non-chemist’s view. A mole tells us “how many?”. You know what your neighbor means when they ask to borrow a . dozen. eggs--they want . twelve. eggs. A mole tells us “how many?”. You know (or could figure out!) what Abraham Lincoln meant when he said “four score and seven years ago…” during the Gettysburg Address---a . 2. 1 Couple of. How many is that?. meatballs. 12. 1 dozen. How many is that?. pencils. 144. 1 gross of. How many is that?. stars. 1 mole of. 602,200,000,000,000,000,000,000. 1 mole = . 602,200,000,000,000,000,000,000. Atomic mass. Atoms of different elements have different masses. . Mass of a single atom is incredibly small so a special unit called atomic mass unit (. amu. ) is used. . Atomic Mass. Atoms are composed of three particles:. Avogadro’s Principle – . equal volumes. . of gases at the same temperature and pressure contain . equal numbers of particles. Avogadro’s Formula. . Formula. : . V. 1. . = . V. 2. . . 1 mole of a substance is 6.02 x 10. 23. . representative particles. .. Avogadro’s number = . 6.02 x 10. 23. Avogadro determined the difference between atoms and particles.. Representative particle. 23 . particles. . So a “mole” is a number, very similar to a dozen. . A dozen = 12 . A mole (mol) = 6.022 x 10. 23. It can be found in your reference packet on page one. Avogadro’s number = 6.022 x 10. The Mole in Chemistry . Not this!!. Not this!!!. The Mole. The mole is a counting unit. 1 pair = 2. 1 dozen = 12. 1 mole = 6.022 x 10. 23. atoms. This number is known as Avogadro’s number after Italian chemist . Chapter 9. History. About 200 years ago scientists needed a unit of measure that connected the mass of a molecule or atom with how many of them there were. . Amadeo Avogadro proposed his hypothesis in 1811. At that time, there was no data on the number of particles in a mole, or an agreement on any atomic weights or the standard. . What is Molar Mass? . What is a Mole? . In Latin . mole . means a "massive heap" of material.. A MASSIVE HEAP . - A front end loader operator moves mountain of sugar like sand inside the sugar warehouse at the Port of Palm Beach. (Mark Randall, Sun Sentinel). Matter is made of different kinds of particles. . We count the number of particles of that substance. . Since there are a very large number of particles in any substance, we need to define a unit of measure:.  . What’s a mole?. The . mole. is a unit of . measure. .. Just like meters tells us . length. and seconds tells us how much . time. , . the . mole. measures an . amount. . (how much).. Units of measure similar to mole include: . The amount of a substance that contains:. 6.02 x 10. 23 . particles (atoms, molecules, formula units). . 22.4 L (volume). X grams (molar mass). Put simply:. A mole is a unit of .