Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Question

Is my math correct and whats #3

Experiment: You perform the distillation of the cyclohexane/toluene mixture as shown in the JOVE Video. The starting solution contains 2mL of cyclohexane and 2 ml of toluene. At temperature of 95°C, a 1.5mL sample is collected and based on the boiling point diagram the composition of the vapors is 72/28 (consider that the densities are identical for cyclohexane and toluene). 1. Calculate the volume of cyclohexane and volume of toluene collected at 95°C. Volume of vapor: total volume - volume of sample (2+2)-1.5=2.5ml Volume of cyclohexane: % hexane/total % * volume of vapor (72/72+2.5)*2.5ml=1.8 Volume of toluene: % hexane/total % * volume of vapor (28/72+28)*2.5-0.7 2. Calculate the ratio of cyclohexane/toluene remaining in the boiling solution at 95°C. Volume of cyclohexane in sample: (volume of total cyclohexane)-(volume of cyclohexane in vapor) 2-1.8=0.2 Volume of toluene in sample: (volume of total toluene)-(volume of toluene in vapor) 2-0.7=1.3 Ratio of cyclohexane and toluene is sample: 0.2ml/1.3ml=2/13 3. Discuss the reason for the different composition between the vapor and the boiling solution at 95°C.
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Transcribed Image Text:Experiment: You perform the distillation of the cyclohexane/toluene mixture as shown in the JOVE Video. The starting solution contains 2mL of cyclohexane and 2 ml of toluene. At temperature of 95°C, a 1.5mL sample is collected and based on the boiling point diagram the composition of the vapors is 72/28 (consider that the densities are identical for cyclohexane and toluene). 1. Calculate the volume of cyclohexane and volume of toluene collected at 95°C. Volume of vapor: total volume - volume of sample (2+2)-1.5=2.5ml Volume of cyclohexane: % hexane/total % * volume of vapor (72/72+2.5)*2.5ml=1.8 Volume of toluene: % hexane/total % * volume of vapor (28/72+28)*2.5-0.7 2. Calculate the ratio of cyclohexane/toluene remaining in the boiling solution at 95°C. Volume of cyclohexane in sample: (volume of total cyclohexane)-(volume of cyclohexane in vapor) 2-1.8=0.2 Volume of toluene in sample: (volume of total toluene)-(volume of toluene in vapor) 2-0.7=1.3 Ratio of cyclohexane and toluene is sample: 0.2ml/1.3ml=2/13 3. Discuss the reason for the different composition between the vapor and the boiling solution at 95°C.
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