1. The vapor-liquid equilibrium data for the heptane-toluene system is shown below. We have 100 moles of a mixture that contains 40 mole % heptane. Be sure to use graph paper or Excel for your graph. | T- °C | x-liquid mole fraction heptane | y-vapor mole fraction heptane | | :--- | :--- | :--- | | 112 | 0 | 0 | | 110.75 | 0.025 | 0.048 | | 106.8 | 0.129 | 0.205 | | 104.5 | 0.25 | 0.349 | | 102.95 | 0.354 | 0.454 | | 101.35 | 0.497 | 0.577 | | 99.73 | 0.692 | 0.742 | | 98.9 | 0.843 | 0.864 | | 98.5 | 0.94 | 0.948 | | 98.35 | 0.994 | 0.993 | a. What are the bubble and dew points of this mixture? b. What is the state of the system at: i. 99 °C ii. 103.4 °C iii. 109 °C? c. At 103.4 °C: i. What are the compositions of the liquid and vapor phases? ii. How many moles of liquid are present? iii. How many moles of vapor are present? d. At what temperature will 50 moles of vapor be in equilibrium with 50 moles of liquid? What are the liquid and vapor compositions at this temperature?
Added by Pablo F.
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- Plot the x-liquid mole fraction of heptane on the x-axis and the y-vapor mole fraction of heptane on the y-axis. - Plot the temperature (T) on a secondary axis to visualize the bubble and dew points. Show more…
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A vapor mixture containing 30 mole $\%$ benzene and $70 \%$ toluene at 1 atm is cooled isobarically in a closed container from an initial temperature of $115^{\circ} \mathrm{C}$. Use the $T x y$ diagram of Figure $6.4-1$ to answer the following questions. (a) At what temperature does the first drop of condensate form? What is its composition? (b) At one point during the process the system temperature is $100^{\circ} \mathrm{C}$. Determine the mole fractions of benzene in the vapor and liquid phases and the ratio (total moles in vapor/total moles in liquid) at this point. (c) At what temperature does the last bubble of vapor condense? What is its composition?
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