The vapor pressures of several solutions of water-propanol(Ch3Ch2Ch2OH) were det
ID: 690090 • Letter: T
Question
The vapor pressures of several solutions of water-propanol(Ch3Ch2Ch2OH) were determined at various compositions, with thefollowing data collected at 45C:XH2O Vapor pressure (torr) 0 74.0 .15 77.3 .37 80.2 .54 81.6 .69 80.6 .83 78.2 1.00 71.9
a.) Are solutions of water and propanol ideal? explain. b.) predict the sign of ^Hsoln (delta H soln) forwater-propanol solutions. c.) Are the interactive forces between propanol and watermolecules weaker than, stronger than, or equal to the interactiveforces between the pure substance? Explain. d.) Which of the solutions in the data would have the lowestnormal boiling point?
XH2O Vapor pressure (torr) 0 74.0 .15 77.3 .37 80.2 .54 81.6 .69 80.6 .83 78.2 1.00 71.9
a.) Are solutions of water and propanol ideal? explain. b.) predict the sign of ^Hsoln (delta H soln) forwater-propanol solutions. c.) Are the interactive forces between propanol and watermolecules weaker than, stronger than, or equal to the interactiveforces between the pure substance? Explain. d.) Which of the solutions in the data would have the lowestnormal boiling point?
Explanation / Answer
The vapor pressures of severalsolutions of water-propanol(CH3CH2CH2OH) were determined atvarious compositions. XH2O Pvap XH2O Pvap 0 74.0 .15 77.3 .37 80.2 .54 81.6 .69 80.6 .83 78.2 1.00 71.9 A) An ideal solution would have a vapor pressure valuethat is between the value of the vapor presure of pure proponol andpure water .The vapor pressure of the solutions are not withinthees limits thay are not ideal . B) The vapor pressures of the solutions are greaterthan the vapor pressure of the pue solvent .This means that theIMFs (Interactive Moleculer Forces) become weaker when insolutions .Energy must be given off when the substance are mixedgiving rice to endothermic (negative )Enthalpy of thesolution . C) The Interactive forces between the water and Proponol isweaher than those between pure substances .(higher the vaporpressures for solutions indicates a greater tendency to escapewhich can only which can come only from weake IMFs when proponoland Water ae mixed together) D) The mixture with highest vapor pressure would have lowestnormal boiling point this is the solution with a mole fraction ofwater =0.54 (81.6 is the highest value in the table )Related Questions
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