Chem_208_05_Web - Today: Finishing Ch. 7 (7.9 Optional)...

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Today: Finishing Ch. 7 (7.9 Optional) Starting Chemical Kinetics, Ch. 14 Please include Your Name, Lab TA Name, and Lab Day on Homework Thursday.
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Bomb: Const. V Open Cup: Const. P = H
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Standard States and Standard Enthalpy Changes Standard State: P = 1 bar (10 5 Pa) Note that 1 atm. = 1.01325 bar T = 298.15K (25 o C), unless stated otherwise. e.g.,H 2 O (l), Hg (l), CO 2 (g), P(white), Fe(s), C(s,graphite) The standard enthalpy of reaction is the enthalpy change when reactants and products are in their standard states, unless otherwise noted . It is denoted with a superscript degree symbol, H o
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Hess’s Law If a process occurs in stages or steps, the enthalpy change for the overall process is the sum of the enthalpy changes for the individual steps (since enthalpy is a state function). Suppose we want to know the standard enthalpy of combustion of carbon to form carbon monoxide: C (s) + ½O 2 (g) CO(g) H o = ? Unfortunately, if we burn C (s), we will only form CO
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This note was uploaded on 05/18/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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Chem_208_05_Web - Today: Finishing Ch. 7 (7.9 Optional)...

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