Name Experiment 10 Enthalpy of Vaporization CM1001 Fall 2023 The Clausius-Clapeyron Equation is used extensively by scientists and has a good theoretical basis. Chemical engineers often need a more accurate predictive equation for vapor pressure, even if it is only empirically based. These common equations used are the Antoine, Riedel and Wagner Equations, with the Riedel and Wagner equations being more complex. The Antoine equation given below, is typically useful in the range of 1 to 200 kPa (about 0.01 - 2 atm). In the formula, P is in mm Hg, T is in degree Celsius and A, B, C = the Antoine coefficients specific for each substance. Acetone n-hexane A 7.2316 6.87024 a. Acetone v.p. @ 46.0 °C atm Show calculations: log(P) = A - Section B 1277.03 1168.72 B T+C с 237.23 224.21 2a. Use this information and the Antoine equation to calculate the following vapor pressures at 46.0° C, and compare them to the predictions given by the Clausius-Clapeyron equation. Range, °C -32 to 77 -25 to 92 b. n-hexane v.p. @ 46.0 °C atm/nName Experiment 10 Enthalpy of Vaporization CM1001 Fall 2023 2b. How do the values of vapor pressures predicted by the Antoine equation in 2a compare to those given by the Clausius-Clapeyron equation you calculated in question 1? Calculate %difference to support your claim. Hint: If the values are too far off from each other, check your calculations in question 1. Is AHvap in J and temperature in K? %difference = |value 1-value2\/average Section 2c. To check the predictive ability of the Antoine Equation, calculate the v.p. of acetone and n- hexane at their respective boiling points, 56.1 °C and 68.7 °C and calculate the percent deviation from the expected value. Recall that the normal boiling point (b.p.) is the temperature at which the v.p. = 1 atm = 760 mm Hg. Predicted v.p. at b.p. Acetone n-hexane Show calculations: % deviation

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Name Experiment 10 Enthalpy of Vaporization CM1001 Fall 2023 The Clausius-Clapeyron Equation is used extensively by scientists and has a good theoretical basis. Chemical engineers often need a more accurate predictive equation for vapor pressure, even if it is only empirically based. These common equations used are the