If SR = 100 torr and PR = 350 torr, then which of the following cannot be a mole fraction of A in vapour phase and a mole fraction of A in liquid phase respectively?
A
310 and 29
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B
79 and 310
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C
29 and 710
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D
29 and 310
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Solution
The correct options are A310 and 29 B79 and 310 C29 and 710 SR represents the partial pressure of A (PA). It is equal to 100 torr.
PR represents the partial pressure of B.(PB). It is equal to 350 torr.
Hence, the total pressure is PT=100torr+350torr=450torr.
The mole fraction of A in the vapor phase is YA=PAPT=100torr450torr=29.
The vapor pressure of pure B is 500 torr. The mole fraction of B in the liquid phase is XB=PBP0B=350torr500torr=710.
The mole fraction of A in the liquid phase is XA=1−710=310