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The vapour pressure of ethanol and metha...

The vapour pressure of ethanol and methanol at 298 K is 44.5 mm and 88.7 mm respectively. At same temperature, if ideal solution is prepared by mixing 60 gm of ethanol and 40 gm of methanol. Then find out mole fraction of methanol in vapour state.

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The correct Answer is:
`0.656`
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The vapour pressure of ethanol and methanol ate 44.5 mm Hg and 88.7 mm Hg , respectively. An ideal solution is formed at the same temperature by mixing 60g of ethanol and 40g of methanol. Calculate the total vapour pressure of the solution and the mole fraction of methanol in the vapour.

Two liquids A and B form an ideal solution. At 300 K , the vapour pressure of a solution containing 1 mol of A and 3 mol of B is 550 mm Hg . At the same temperature, if 1 mol more of B is added to this solution, the vapour pressure of the solution increases by 10 mm Hg . Determine the vapour pressure of A and B in their pure states.

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