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36. A solution has a 1 : 4 mole ration of pentane to hexane. The vapour pressure of the pure hydrocarbons at

20° C are 440 mmHg for pentane and 120 mmHg for hexane. The mole fraction of pentane in the vapour phase would be

a. 0.549

b. 0.200

c. 0.786

d. 0.478

Ans. d

(13)

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