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Chem 1LD F20 - Thao Tran Experiment 2: Vapor Pressure/Comp Study Work PDF Version generated by

Thao Tran on Oct 20, 2020 @01:35 PM ICT

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Experiment 2: Vapor Pressure/Comp Study Work

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Experiment 2: Vapor Pressure/Comp Study Work

3 of 4 Thao Tran - Oct 19, 2020, 11:49 PM ICT

Part I: One Isolated Ethanol Molecule

Energy: -153.222916 au Dipole Moment: 2.06 debye Part II: Ethanol Dimer

Energy: -306.465189 au Dipole Moment: 3.10 debye What do you notice about the dipole moment vector and the hydrogen bond? Think about why the direction of the dipole vector makes sense in terms of the idea of hydrogen bond donor vs. acceptor. Hydrogen bond donates electrons. Therefore the direction of dipole vector makes sense. Hydrogen bond donor will be more positive when it gives electrons and hydrogen bond acceptor will be more negative once it accepts electrons. Sapling #5 Work: 1 au = 2625.50 kJ/mol Energy of single EtOH molecule: -153.22 au Energy of 2 EtOH molecules: -153.22 x 2 = -306.44 au Energy of 2 EtOH molecules + Hydrogen bonds: -306.47 au Energy of Hydrogen bonds: (energy of 2 EtOH) - (Energy of 2 EtOH with H-Bonds) = -306.44 au - (-306.47 au) = -0.03 au Convert Energy of H-bonds (au to kJ/mol): -0.03 au x (2625.50 kJ/mol / 1 au) = -78.765= -80 kJ/mol

Experiment 2: Vapor Pressure/Comp Study Work

4 of 4 Thao Tran - Oct 17, 2020, 3:22 PM ICT

' ethanol_dimer.spartan(352 KB) - download Thao Tran - Oct 17, 2020, 3:22 PM ICT

' ethanol.spartan(156 KB) - download...