B. At what temperature does the liquid have an equilibrium vapor pressure of 250
ID: 705638 • Letter: B
Question
B. At what temperature does the liquid have an equilibrium vapor pressure of 250 mmHg? At what temperature is it 650 mmHg? (Please help, I have no idea how to start this.. I know the 250 mmHg will be between 108.3-151.4, but I have no idea how to figure the actual value out) C. What is normal boiling point of limonene? 38. ? The following data are the equilibrium vapor pres- sure of limonene, CioHi6, at various temperatures. (Lim- onene is used as a scent in commercial products.) Temperature (C) Vapor Pressure (mm Hg) at 1.0 14.0 53.8 84.3 108.3 151.4 10. 40. 100. 400. (a) Plot these data as In P versus 1/Tso that you have a (b) At what temperature does the liquid have an equi- (c) What is the normal boiling point of limonene? graph resembling the one in Figure 12.18. librium vapor pressure of 250 mm Hg? At what tem- perature is it 650 mm Hg? (d) Calculate the molar enthalpy of vaporization for lim- onene using the the Clausius-Clapeyron equation.Explanation / Answer
According to clausius-clapeyron equation, lnP vs 1/T graph will give a straight line. So a linear fitted graph is drawn from given data and then temperatures correspond to given vapour pressures were extracted from it.
From graph 1/T correspond to ln(250) is 0.00245 K-1. So temperature correspond to 250 mm Hg is 408.2 K.
From graph 1/T correspond to ln(650) is 0.00227 K-1. So temperature correspond to 650 mm Hg is 440.5 K.
At normal boiling point, vapour pressure is equal to atmospheric pressure (760 mm Hg). So temperature correspond to 760 mm Hg is 446.4 K.
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