Chem162_IMForces_PartII_Report_042813-1

Molecules a portion of the enthalpy of vaporization

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molecules, a portion of the enthalpy of vaporization is due to dispersion forces (all molecules have dispersion forces) and the other to a polar component. In the boxes provided below, draw the structural formula for each molecule (can be hand-drawn). Based on the structures, which molecule provides the dispersion forces component for itself and each of the others and what assumption is made in order to use the value for one compound to account for the dispersion forces in the others? (7 pts) R esults and Discussion How do your enthalpies of vaporization compare with the literature values? How do your entropies of vaporization compare with the literature values? Discuss your results and include % error calculations. (2 pts) Part I: 30 points (report worksheet completed and handed in before leaving lab) Part II: 30 points (Lab notebook pages worth 5 pts - total for reports and notebook is 65 pts) Type sample calculations for determining H and S for n-pentane. Place your plot of ln(Pvap) vs 1/T here (cover this instruction box so your graph is an appropriate size). Properly label your graph (labels for axes, including units, and a title). Include a trendline and its equation and R2 value on your graph. This is done by right-clicking on one of the data points on your graph and choosing "Add Trendline" from the drop down menu. The first tab asks what type of trendline you wish to use, and the Options tab allows you to include the trendline equation and R2 value.
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