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A solution has a 1 : 4 mole ratio of pen...

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of pure hydrocarbons at `20^@C` are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in vapour phase woule be

A

0.786

B

0.478

C

0.549

D

`0.200`

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • A solution has 1:4 molar ratio of pentane and hexane. The vapour pressure of pure hydrocarbons at 20^@C are 440 mm Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in vapour phase would be

    A
    `0.200`
    B
    `0.478`
    C
    0.547
    D
    0.786

  • Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at T(K) are 50mm Hg and 40 mm Hg respectively. What is the mole fraction of toluene in vapour phase when 117 g of benzene is mixed with 46g of toluene? (molar mass of benzene and toluene are 78 and 92 g mol^(-1) respectively).

    A
    0.78
    B
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  • A solute has 2:3 molar ratio of toulene to benzene. The vapour pressure of benzene and toulene at 25^@C are 95 and 28 bar respectively. The mole fraction of Toulene vapour is

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    B
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    C
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