CHEMISTRY- vapour pressure

posted by .

Bromobenzene, C6H5Br, and chlorobenzene, C6H5Cl, form essentially ideal solutions in all proportions. At 100°C, the equilibrium vapour pressure of bromobenzene is 137mmHg and that of chlorobenzene is 285mmHg. Calculate the equilibrium vapour pressure above a 17.6% (w/w) solution of bromobenzene in chlorobenzene at a temperature of 100°C
16305 mmHg
163 mmHg
25895 mmHg
265 mmHg
157 mmHg

  • CHEMISTRY- vapour pressure -

    Are you sure the 25895 choice is not 258.95?

  • CHEMISTRY- vapour pressure -

    Since the solution is 17.6% in bromobenene, that means 17.6 g/100 g soln OR
    17.6 g bromobenzene in a solution made up of 17.6 g bromogenzene and (100-17.6 = 82.4 g chlorobenzene).
    Determine moles bromo and moles chloro.
    Calculate mole fraction bromo and chloro.
    Then vapor pressure of each component is
    P = X*Po
    You will have one partial pressure for the bromo and one partial pressure for th chlor. Add them for the total pressure. Post your work if you get stuck.

  • CHEMISTRY- vapour pressure -

    i have 0.112 mol of bromo,
    and 0.732 mol chloro,
    but i am stuck on the mole fraction.
    Do i just do 1-0.112= 0.888 or am i missing a step?

  • CHEMISTRY- vapour pressure -

    ok, this is what I have.
    Xbromo= 0.112/+0.732+0.112=0.133
    Xchloro= 1-0.133= 0.867
    P=Xbromo*p= 0.133*137= 18.221mmHg
    P=Xchloro*p= 0.867*285= 247.095mmHg
    so I add 18.221+247.095= 265.316mmHg
    Is that right?

  • CHEMISTRY- vapour pressure -


Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    water has a vapour pressure of 23.76 torr at 25C.what is the vapour pressure of a solution of sucrose ,if its mole fraction is 0.25?

    At 63.5 degreesC, the vapour pressure of H2O is 23.3kPa and that of ethanol is 53.3kPa. A solution is made by mixing egual masses of H2O and C2H5OH. a. what is the mole fraction of ethanol in the solution?
  3. chem

    at 40 degree C , the vapour pressure of water is 55.3 mm of hg. calculate the vapour pressure at same temp. of 10%aques solution of urea?
  4. physics

    Again, I know I keep posting questions but I'm begging you for help. At 25°C the vapour pressure of pure pentane is 511 torr and that of hexane is 150. torr. What is the mole fraction of pentane in a pentane-hexane solution that has …
  5. Chemistry

    Find molality of a solution containing non - volatile solute if its vapour pressure is 2% below the vapour pressure of pure water
  6. chemistry

    Two liquids A and B on mixing form an ideal solution. The vapour pressure of the solution containing 2 moles of A and 4 moles of B is 0.2 atm. If the vapour pressure of pure A at a certain temperature is 0.3 atm then what will be the …
  7. Chemistry - University

    Pentane (C5H12) and hexane (C6H14) form an ideal solution. The vapour pressure of pentane at 25oC is 511 mmHg and that for hexane is 150 mmHg. A solution is prepared by mixing pentane (density = 0.63 g/mL) and hexane (density = 0.66 …
  8. science

    the vapour pressure of pure liquid benzene and toluene are 160mm and 60 mm repectively. calculate the vapour pressure of an equimolar solution at the same temperature?
  9. Chemistry

    Vapour pressure of ideal solutions at 25c the vapour pressure of chloroform and carbon tetrachloride are 26.54 and 15.27 kpa respectively. If the liquids from ideal solutions. (A) what is the composition of the vapour in equilibrium …
  10. PCB

    A 298k the vapour pressure of water is 23.75mmhg.calculate the vapour pressure at same tempreature over 5% aqurous solution of urea?

More Similar Questions