PPT-2.8-2.9 Atomic Mass & Molar Mass

Atomic Mass What is an elements atomic mass The weighted average of its naturally occurring isotopes When looking at an element on the periodic table of elements where is atomic mass found Usually the top left hand corner of each elements box However on the periodic table that you will use for your AP Exams this number will be located below each elements chemical symbol. S-C-8-1_The Mole Presentation. Source: http://en.wikipedia.org/wiki/Mole_(animal). The Mole. The mole is a counting unit for chemists, the same way a baker uses a dozen.. 1 dozen = 12 objects. 1 mole = . #1: Rubidium has two common isotopes, . 85. Rb and . 87. Rb. . If the abundance of . 85. Rb is 72.2% and the abundance of . 87. Rb is 27.8%, what is the average atomic mass of rubidium?. PROCEDURE:. Calculate the following percentage by mass:. percent = portion/total x 100. If two samples are the same substance, they should have the . same percent composition by mass.. A compound will have the same physical and chemical characteristics.. Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?. Background: atomic masses. Look at the “atomic masses” on the periodic table. What do these represent?. The Mole. mole. (mol)- SI Unit for the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12.. A unit of counting, like the dozen.. Avogadro’s Number. CHAPTER 7-2. How to find the molar mass of an element. The . molar mass . of any substance is the mass (in grams) of one mole of the substance.. It is expressed as grams/mole (. g/. mol. ).. The molar mass of . Molar Mass. Molar mass- same as atomic mass but for a compound rather than an atom.. To determine the molar mass of any compound you add up the atomic mass of all atoms present.. NaCl. 22.99 35.45 = . Mr. Guerrero. Stoichiometry. Homework, due on the day of chapter exam. . Zumdahl. Text, 9. th. ed. . page 126: . #10, 13, 18, 38, 40, 46, 50, 66, 74, 84, 86, 88, 100, 106, 122, 124, 126.. Write out all conceptual(non-math) questions & answer in complete sentences.. BASIC CHEMISTRY. CHM 138. Dalton’s Atomic Theory (1808). 1.. . Elements are composed of extremely small particles called . atoms. . . 2. All . atoms. of a given element are . identical, having the same size, mass and chemical properties. 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:. Composition of Substances and Solutions Atomic Mass and Formula Mass; Mole & Molar Mass; Percent Composition of Compounds; Determination of Empirical & Molecular Formulas; Molarity Other Units for Solution Concentrations Present and Future. WANG . Meng. Institute of Modern Physics, CAS. ARIS2014, Tokyo, June 2. Outline. Introduction. . atomic mass, measurement, evaluation …. Present status. . publication of . 12.00 g C-12 = 1 mol The number of particles in 1 mole isatoms 1 mol6.022 The molar mass of an element is useful to convert moles of an element to grams, or grams . to moles. . . . For example, 1 mole . of . sodium has . a . mass . of . 22.99 grams.. Learning Goal . Calculate the molar mass of a .