PPT-Interconversion of mass, moles and number of atoms or molecules.

A Dozen Elephants amp A Dozen Paper Clips Would a dozen of each weigh the same amount Give a reason for your answer Moles and Mass The molar mass gives us the relationship between the number of moles and the mass of an element or compound. The Building Blocks of Matter. Chapter 2. Chapter Outline. 2.1 The . Rutherford Model of . Atomic Structure. 2.2. . Nuclides and Their Symbols. 2.3 . Navigating the Periodic Table. 2.4 The . Masses of Atoms, Ions, and Molecules. 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.. Part 2. 1 dozen = 12 items. Let’s do some calculations. I have 12 dozen, how many eggs. ?. 12 x 12 = 144 eggs. I have 57 dozen, how many doughnuts. ?. 57 x 12 = 684 doughnuts. I have 10 dozen, how many golf balls. 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. Isotopes of Carbon. . . C-12 has 6 protons and 6 neutrons with an abundance of 98.90%. C-13 has 6 protons and 7 neutrons with an abundance of only 1.10%. The Mole. . . The number of units (atoms) in this amount of carbon-12 is our “bunch”. This bunch is called a . Moles and Mass. The . molar mass . gives us the relationship between the . number of moles . and the . mass of an element or compound. .. We can . use the molar mass . to . calculate . the . mass. or . Solution. (a) . The left box, which represents the reactants, contains two kinds of molecules, those composed of two oxygen atoms (O. 2. ) and those composed of one nitrogen atom and one oxygen atom (NO). The right box, which represents the products, contains only molecules composed of one nitrogen atom and two oxygen atoms (NO. Chapter Objectives. Describe the chemical processes used in biomass production and conversion to biofuels.. Explain balancing a chemical reaction as an application of the . law of conservation of mass. 12.00 g C-12 = 1 mol The number of particles in 1 mole isatoms 1 mol6.022 The Mole602 X 1023in scientific notationThis number is named in honor of Amedeo Avogadro 1776 18561 dozen cookies 12 cookies100 cookies 102 cookiesA million of cookies 106 cookies1 mole of cookies 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. O. 3. ) . C/W. 23/09/2020. 3.2.1. Ar of Al = 27. Mass of Al in Al. 2. O. 3. = 27 x 2 = 54. Mr of Al. 2. O. 3. = (27x2) +(16x3) = 102. Percentage of aluminium = 54/102 x 100 = 52.94%. Progress Outcomes. 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. . r. ). Total of all the relative atomic masses of all the atoms in the compound. % mass of an element in compound . =. A. r. x number of atoms of that element. M. r. of the compound. x100. e.g. % by mass of chloring in MgCl.