esteringChemistry Chapter 13 Microsoft Edge htps teringchemistry.com/mycfitemVie

Question

esteringChemistry Chapter 13 Microsoft Edge htps teringchemistry.com/mycfitemView?assignmentProblem D 96805886 Chapter 13 Exercise 13.94 Constants 1 Berodic Table Part A An aqueous CaCh solution has a vapor pressure of 80 1 mmig at 50·C Tho vagor pressuro of puro waler-this terrgerature is 926 mmlg Whiatl is the concentration of CaCl in mass percent 49 %by mass Previous Answers Reuest Answer X Incorrect: Try Again; 2 attempts remaining Return to Provide Feedback Type here to search 10 DOLL Esc F3 F4 FS F6

Explanation / Answer

vapor pressure of solution = mole fraction of water x vapor pressure of water

mole fraction of water = 80.1 / 92.6 = 0.8650

mole fraction of Ca2+ and Cl- ions = 1 - 0.8650 = 0.1350

moles of CaCl2 = 0.1350 / 3 = 0.0450

mass = moles x molar mass,

mass of CaCl2 = 0.0450 x 111 = 4.995 g

mass of H2O = 0.8650 x 18 = 15.57 g

mass% CaCl2 = { mass of CaCl2/(mass of CaCl2 + mass of H2O) } x 100

                       =   4.995 / (4.995 + 15.57) X 100

                     = 24.3%

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