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. Chapter 2 BLB 12. th. Expectations. Recognize important steps in the discovery of the atom and its structure.. Work with isotopes.. Learn about the periodic table.. Differentiate between molecular and ionic compounds.. 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.. Do Now: Convert the following. What is the conversion factor for . feet to inches: 1 foot = ___inches. Feet to yards: 1 foot = ___yards. c) 12 . ft. = ___________ inches. d) 72 inches = ________ yards. Nivaldo. J. . Tro. Chapter 6. Chemical Composition. Dr. Sylvia Esjornson. Southwestern Oklahoma . State University . Weatherford, OK. How Much Sodium? . Sodium is an important dietary mineral . that . 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. 5.6 x 10. 3. . Remembering Scientific Notation…... The Mole . Main unit in chemistry we will use ! ! ! . Describes the amount of atoms in a particular substance . 1 mole = 6.02 x 10. 23. atoms. (KNOW THIS CONVERSION). By: Skye Smith. What is Mass?. Mass can be defined as a quantitative measure of an object's resistance to the change of its speed. . Scientifically speaking, mass IS different than weight, which is the measure of a planet’s gravitational force on an object. 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 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 . 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. . subscript in a chemical formula.. Indicate the number of each type of atom in the following balanced chemical equation:. . Fe. 2. S. 3. (. s. ) . + . 6HCl(. aq. ) → 2FeCl. 3. (. aq. ) . + . 3H. 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:. 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.