Thermochemistry

Thermochemistry - CH3 Thermochemistry Physical change 3.1 The enthalpy of phase transition 3.2 Atomic and molecular change(Read Chemical change 3.3

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CH3 Thermochemistry Physical change 3.1 The enthalpy of phase transition 3.2 Atomic and molecular change (Read) Chemical change 3.3 Enthalpies of combustion 3.4 The combination of reaction enthalpies 3.5 Standard enthalpies of formation 3.6 Enthalpies of formation and molecular modelling 3.7 The variation of reaction enthalpy with temperature
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3 Phase Changes solid liquid gas melting or fusion freezing vaporizing condensing sublimination endothermic exothermic are determined by the interplay between kinetic and intermolecular forces
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transition temperature* Substance Freezing point, T f /K Δ fus H o /(kJ mol - 1 ) Boiling point, T b /K Δ vap H o /(kJ mol Ammonia, NH 3 195.3 5.65 239.7 23.4 Argon, Ar 83.8 1.2 87.3 6.5 Benzene, C 6 H 6 278.7 9.87 353.3 30.8 Ethanol, C 2 H 5 OH 158.7 4.60 351.5 43.5 Helium, He 3.5 0.02 4.22 0.08 Mercury, Hg 234.3 2.292 629.7 59.30 Methane, CH 4 90.7 0.94 111.7 8.2 Methanol, CH 3 OH 175.5 3.16 337.2 35.3
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This note was uploaded on 02/04/2011 for the course CHEM 3050 taught by Professor Staff during the Spring '08 term at Kennesaw.

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Thermochemistry - CH3 Thermochemistry Physical change 3.1 The enthalpy of phase transition 3.2 Atomic and molecular change(Read Chemical change 3.3

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