PPT-The Mole and Avogadro’s Number

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 . 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 . Unit 18. Avogadro’s Number and the Mole. Significance of Avogadro’s Number (5.3). Size of Avogadro’s Number (5.3). Definition of a Mole (5.3). Formula Mass (and Molecular Mass) (5.3). Introduction to Avogadro’s Number . 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. . . Avogadro’s Law Avogadro’s Principle – equal volumes of gases at the same temperature and pressure contain equal numbers of particles What is Avogadro’s Law Avogadro’s 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. Use . the coefficients to predict the amount of reactant consumed or product formed. The ratio of the coefficients is a ratio of the moles taking part in a reaction.. Reactants (on the left of the arrow) are consumed. David Strauch Thesis Committee Lyndon Wester Chairperson Mary McDonald Matt McGranaghan Keywords Mole Cultural b12 Speaking of mole13 Getting a taste of mole47 62 Aspects of Mesoamerican plant dom binders. 2. Begin the Do Now . . Track Your Progress on QUIZ . LTs. . handout . (15 min. ). . The Mole and Molar Mass!. What do the following all have in common?. What doesn’t belong?. Dozen. Couple. 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 . 2. .. 2.) How many moles are there in 63.2g of Cl. 2. ?. 60.4L O. 2. . 22.4L O. 2. . 1 mol O. 2. . = 2.7 mol O. 2. 63.2g Cl. 2. 70g Cl. 2. 1mol Cl. 2. = 0.903mol Cl. 2. Ch. . 9. Math In Chemistry. 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. . 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). 2017 . P3 Challenge – . Determine the . number of Mg atoms in 0.35 g of . MgO. .. Today’s Objective –. Stoichiometry. Assignment: . Stoichiometry Worksheet. Agenda. Hmk. . Review. Moles and Reactions.