equation, the dependence of the vapor pressure of a pure dln (p/p) AvapHm. Therefore, a plot...
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equation, the dependence of the vapor pressure of a pure dln (p/pᵒ) AvapHm. Therefore, a plot of In (p/pº) ΔΗ. d(1/T) R According to the Clausius-Clapeyron liquid on temperature follows . against 1/T (where T is the absolute temperature and pº 100 kPa) should have a slope of -Avap Hm/R. If the enthalpy of vaporization is constant, the plot is linear. (a) Use a plot of the following data to determine the enthalpy of vaporization of piperidine. = p/kPa 6.5 14.4 14.8 26.7 51.5 83.7 122.5 196 297 307 374 T/K 279.48 286.78 286.85 292.58 299.16 304.27 308.37 313.57 318.25 318.69 321.12 Data from L. Lepori, E. Matteoli, and P. Gianni, J. Chem. Eng. Data 62, 194 (2017). (b) Using the same data make a plot of ln(p/pº) vs. T and fit it to Eq. (12.27) to determine the values of a and b. The standard boiling point of piperidine is Tb = 419.2 K. Use the constants you obtain to calculate the value of AvapHmº at 280, 300 and 320 K. equation, the dependence of the vapor pressure of a pure dln (p/pᵒ) AvapHm. Therefore, a plot of In (p/pº) ΔΗ. d(1/T) R According to the Clausius-Clapeyron liquid on temperature follows . against 1/T (where T is the absolute temperature and pº 100 kPa) should have a slope of -Avap Hm/R. If the enthalpy of vaporization is constant, the plot is linear. (a) Use a plot of the following data to determine the enthalpy of vaporization of piperidine. = p/kPa 6.5 14.4 14.8 26.7 51.5 83.7 122.5 196 297 307 374 T/K 279.48 286.78 286.85 292.58 299.16 304.27 308.37 313.57 318.25 318.69 321.12 Data from L. Lepori, E. Matteoli, and P. Gianni, J. Chem. Eng. Data 62, 194 (2017). (b) Using the same data make a plot of ln(p/pº) vs. T and fit it to Eq. (12.27) to determine the values of a and b. The standard boiling point of piperidine is Tb = 419.2 K. Use the constants you obtain to calculate the value of AvapHmº at 280, 300 and 320 K.
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