Week 9 Notes
Week 9 Notes Chem 1407
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This 1 page Class Notes was uploaded by Marissa Reyes-Hernandez on Thursday October 22, 2015. The Class Notes belongs to Chem 1407 at University of Texas at El Paso taught by Dr. Andrew Pardo in Fall 2015. Since its upload, it has received 34 views. For similar materials see Introduction to Chemistry in Chemistry at University of Texas at El Paso.
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Date Created: 10/22/15
Week 9 Notes Chem Thursday ctober 22 2 15 1235 PM One mole of an element contains 602 X 10quot23 atoms One mole of a compound contains 602 X 10quot23 molecules or formula units The molar mas gmole of any substance is the mass in grams equal numerically to its atomic mass or the sum of the atomic masses which have been multiplied by their subscripts in a formula The molar mass is used as a conversion factor to change a quantity in grams to moles or to change a given number of moles to grams n balanced equation the total mass of the reactants is equal to the total mass of the products The coefficients in an equation describing the relationship between the moles of any two components are used to write molemole factors When the number of moles for one substance is known as molemole factor is use3d to find the moles of different substance in the reaction In calculations using equations molar mass and molemole factors are used to change the number of grams of one substance to the corresponding grams of a different substance The percent yield of a reaction indicates the percent of product that is actually produced by a reaction The percent yield is calculated by dividing the actual yield in grams of product by the theoretical yield in grams which is expressed as a percent A limiting reactant is the reactant in the reaction that produces the smaller amount of product When the mass of two or more reactants is given the actual mass of a product is calculated from the limiting reactant In a reaction the reacting particles must collide with energy equal to or greater than energy of activation The heat of reaction is the energy difference between the initial energy of the reactants and the final energy of the products In an exothermic reaction the energy of the reactants is greater Thant that of the products heat is released and is negative In an endothermic reaction the energy of the reactants is lower than that of the products heat is absorbed and is positive