The table below contains vapor pressure values for ethyne (acetylene) vs. the te

Question

The table below contains vapor pressure values for ethyne (acetylene) vs. the temperature in Celsius. Use the Clausius-Clapyeron equation to plot this data. Determine the enthalpy of vaporization of acetylene at 0 degree C. Fit the line with a quadratic. Drop the assumption that Delta_vap H is constant and use Kirchhoff's law to arrive at a better relationship. Using this relationship, determine a better value of Delta_vap H. Evaluate the quality of the correction by comparing the value of the correction term extracted from the data to that calculated using values from our text.

Explanation / Answer

p T 1/T ln p 146 -78 0.005128 4.983607 190 -73 0.005 5.247024 244 -68 0.004878 5.497168 309 -63 0.004762 5.733341 385 -58 0.004651 5.953243 475 -53 0.004545 6.163315 579 -48 0.004444 6.361302 699 -43 0.004348 6.549651 834 -38 0.004255 6.726233 993 -33 0.004167 6.900731 1170 -28 0.004082 7.064759 1370 -23 0.004 7.222566 1593 -18 0.003922 7.373374 1843 -13 0.003846 7.51915 2121 -8 0.003774 7.659643 2429 -3 0.003704 7.795235 2771 2 0.003636 7.926964 3150 7 0.003571 8.055158 3567 12 0.003509 8.17948 4028 17 0.003448 8.301025 4535 22 0.00339 8.41958 5093 27 0.003333 8.535622

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