Chemistry 112 Intermolecular Forces

Chemistry 112 Intermolecular Forces - Rasmussen Drew...

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Rasmussen Drew Rasmussen Chemistry 112 Lab Katri Truhler February 2, 2011 Post-lab Report: Assessing Intermolecular Forces 1. Table I. Compound Lewis Structure Molecular Weight Distillation Range Retention Time acetone See Below 58.08 53.5 - 54.3 0.750 2-butanone 72.10 73.4 - 76.7 1.795 2-pentanone 86.13 92.3 - 99.2 5.765 2-hexanone 100.16 83.5 – 120.0 6.430 a. With this group of ketones molecular weight plays a very important role. As molecular weight goes up so does retention time, distillation range, and the boiling point. All of the molecules are capable of hydrogen bonding because they have an oxygen with 2 pairs of lone electrons. Table II. Compound Lewis Structure Molecular Weight Distillation Range Retention Time
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Rasmussen 2-hexanone See Below 100.16 120.0 – 123.9 4.395 methyl isobutyl ketone 100.16 109.0 – 113.0 3.070 pinacolone 100.16 102.0 – 103.0 2.510 b. The molecular weights of the molecules do not differ, so it can be assumed that differences in retention time and distillation range are caused by differences in intermolecular forces. Pinacolone has the most extensive carbon branching as it has 3 CH3 groups attached to a central carbon on the far right of the structure. It also has the lowest distillation range and retention time. 2-hexanone has the highest distillation range
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Chemistry 112 Intermolecular Forces - Rasmussen Drew...

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