Lab 7.docx - Experiment 7 Intermolecular Forces and...

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Experiment 7 Intermolecular Forces and Evaporation MaryFrances Johnson Alan Bussoletti March 6, 2018 CHEM 1310 Section C27 TA: Shaoren Yuan Honor Pledge – Freshman Chemistry Laboratories I did not copy any portion of this work from the work of other students, old lab reports, or unreferenced materials. I understand that such activity is a violation of the Georgia Tech Honor Code. ____________________________________
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Data and Results: A. Lewis Structures and Intermolecular Forces Table 1. Dominant IMFs in Compounds Studied Compound Molecular Formula Dominant IMF Ethanol CH 3 CH 2 OH Hydrogen Bonding 1-Propanol CH 3 CH 2 CH 2 OH Hydrogen Bonding Acetone CH 3 COCH 3 Dipole-Dipole Forces Pentane CH 3 CH 2 CH 2 CH 2 CH 3 London Dispersion Force Hexane CH 3 CH 2 CH 2 CH 2 CH 2 CH 3 London Dispersion Force Water H 2 O Hydrogen Bonding B. Measuring Evaporation Rates Table 2. Evaporation Rates Compound Evaporation Rate (%/min) Ethanol 4.03% 1-Propanol 1.75% Acetone 6.89% Pentane 8.58% Hexane 26.99% Water 0.68% C. Measuring Temperature Changes During Evaporation Table 3. Temperature Changes During Evaporation Compound T (ºC) Ethanol 9.5 1-Propanol 7.5 Acetone 18.9 Pentane 18.6 Hexane 15.3 Water 4.3
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D. Measurement of Vapor Pressure versus Temperature
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Table 4. Vapor Pressure versus Temperature Compound Ethanol Compound 1-Propanol Temperature (K) Vapor P (atm) Temperature (K) Vapor P (atm) 296.3 0.0121 295.6 0.0310 305.6 0.0762 302.7 0.0707 312.3 0.1246 308.6 0.1007 317.1 0.1715 312.8 0.1209 319.2 0.2132 315.1 0.1390 321.3 0.0744 316.0 0.1327 Air Pressure (atm): 0.9700 Air Pressure (atm): 0.9473 Compound Acetone Temperature (K) Vapor P (atm) 295.3 0.0052 302.9 0.0818 309.9 0.1610 314.9 0.2904 318.9 0.3588 320.6 0.4161 Air Pressure (atm): 0.9550 Compound Hexane Compound Water Temperature (K) Vapor P (atm) Temperature (K) Vapor P (atm) 295.3 0.0455 294.9 0.0008 306.2 0.1245 303.6 0.0436 309.2 0.1788 313.1 0.0829 312.8 0.2287 318.2 0.1170 318.2 0.2852 322.0 0.1428 323.5 0.3709 323.5 0.1633 Air Pressure (atm): 0.9581 Air Pressure (atm): 0.9652 Each pressure indicated in the above Table 4 is of the individual compound. The equation used to find the pressure of each vapor is P vapor = P measured - P air 1 Discussion:
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According to the Chemistry 1310 Laboratory Manual , there are six different types of intermolecular forces (IMFs): ion-ion forces, ion-dipole forces, hydrogen bonding, dipole-dipole forces, dipole-induced dipole forces, and London dispersion forces 1 . As listed in Table 1, the dominant intermolecular force in ethanol is hydrogen bonding. This was determined by looking
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