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The composition of vapour when first bub...

The composition of vapour when first bubble formed is:

A

`y_(A) = 0.6,y_(b) = 04`

B

`y_(A) = 0.48,y_(b) = 0.52`

C

`y_(A) = 0.52,y_(b) = 0.48`

D

`y_(A) = 0.5,y_(b) = 0.5`

Text Solution

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The correct Answer is:
b
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A liquid mixture of benzene and toluene is composed of 1 mol of benzene and 1 mol of toluence. a.If the pressure over the mixture at 300 K is reduced, at what pressure does the first vapour form? b.What is the composition of the first trace of vapour formed? c. If the pressure is reduced further, at what pressure does the last trace of liquid disappear? d.What is the composition of the last trace of liquid? e. What will be the pressure, the composition of the liquid, and the composition of the vapour, when 1 mol of the mixture is vapourized? , Given: p_(T)@ = 32.05 mm Hg , p_(B)@ = 103 mm Hg

The composition of vapour over a binary ideal solution is determined by the composition of the liquid. If x_(A) and y_(A) are the mole fractions of A in the liquid and vapour, respectively find the value of x_(A) for which (y_(A)-x_(A)) has maximum. What is the value of the pressure at this composition?

Knowledge Check

  • Assertion:At equilibrium , vapour phase will be always rich in component which is more volatile Reason : The composition of vapour phase in equilibrium with the solution is determined by the partial pressures of the components

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false

  • Benzene and toluene forms nearly an ideal solution. At 300 K, P_("toluene")^(@)=32.06" mm" and P_("benzene")^(@)=103.01" mm" (of Hg) (i) A liquid mixture is conposed of 3 mole of tolune and 2 mole of benzene. If the pressure over the mixture at 300 K is reduced, at what pressure does the first vapour form ? (ii) What is the composition of the first trace of vapour formed ? (iii) If the pressure is reduced futher,at what pressure does the last trace of liquid dissappear ? (iv) What is the composition of last trace of liquid ?

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    B
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    (ii)x_("toluene")=0.786
    (iii) P=38.23mmhg
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    (ii) `x_("toluene")=0.3181`
    (iii) P=44.25 mmHg
    (iv)`x_("toluene")=0.8281`
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    (i) 74.44 mm Hg
    (ii) `x_("toluene")=0.218`
    (iii) P=32.33 mmHg
    (iv)`x_("toluene")=0.9281`

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