Chem_215_Lecture_4_Color - Bomb: Const. V (w = 0) Open Cup:...

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Unformatted text preview: Bomb: Const. V (w = 0) Open Cup: Const. P E i E f E i E f E E 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. The following are in their standard states: H 2 O (l), Hg (l), CO 2 (g), P(white), Fe(s), C(s,graphite) The standard enthalpy of reaction ( H o ) is the enthalpy change when reactants and products are in their standard states, unless otherwise noted. H for Changes of State Gas Liquid Solid Melting, H fus Vaporization, H vap condensation freezing sublimation deposition Heating Curve For H 2 O: H vap = 44 kJ/mol @ 298K H fus = 6.01 kJ/mol @ 273K Hesss Law If a process occurs in steps, the enthalpy change for the overall process is the sum of the enthalpy changes for the individual steps: Suppose we want to know the standard enthalpy of combustion of carbon to form carbon monoxide: C (s) + O 2 (g) CO(g) H o = ?...
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Chem_215_Lecture_4_Color - Bomb: Const. V (w = 0) Open Cup:...

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