Chem 1061 1st Edition Lecture 17 Outline of Last Lecture 1 Hess s Law Adding Reactions and Enthalpies 2 Standard Enthalpies of a Reaction a Standard Condition b Heat of Formation Outline of Current Lecture 3 Definitions a Heat of Formation b Heat of Combustion c Heat of Vaporization d Heat of Fusion 4 Determining Heat of Reactions from Heat of Formation 5 Quantum Theory and Atomic Structure a Definitions 6 Electromagnetic Radiation Current Lecture Definitions Heat of Formation Reaction of elements to form 1mol of a compound Ca s C s 3 2O2 g CaCO3 s H f Heat of Combustion How much energy per mol fuel reactant CH4 g 2O2 g CO2 g 2H2O g H combustion Heat of Vaporization Liquid to gas reactions H2O l H2O g H vap Takes energy endothermic H2O g H2O l H vap absorbs energy exothermic Heat of Fusion Solid to a liquid H2O s H2O l H fusion H2O l H2O s H These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Determining Heat of Reactions from Heat of Formation NH3 g HCL g NH4Cl s H 1 1 2 N2 g 3 2H2 g NH3 g H f 45 9kJ mol 2 H2 g Cl2 g HCl g H f 92 3kJ mol 3 N2 g 2H2 g 1 2Cl2 g NH4Cl s H f 314 4 kJ mol H rxn m x H f products n x H f reactants H rxn 1mol NH4Cl H f NH4Cl 1mol NH3 H f NH3 1mol HCl H f HCl H rxn 1mol 314 4kJ mol 1mol 45 9kJ mol 1mol 92 3kJ mol H rxn 176 2 kJ Use H f values to calculate H rxn for 4Al s 3MnO2 s 2Al2O3 s 3Mn s H f kJ mol Al 0 MnO2 520 9 Al2O3 1676 Mn 0 2mol 1676 3mol 520 9 1789 3 kJ Quantum Theory and Atomic Structure Quantum Mechanics the theory that explain fundamental nature of energy and matter and accounts for atomic structure Light classical wave properties Matter classical particle nature Quantum particle properties of light and wave properties of matter Electromagnetic Radiation Figure 7 3 Describes wave with frequency and wavelength C speed of light wavelength x frequency
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