Q. In an accident a container containing ethanol(s.g 0.789) falls down in a room of dimension 1*1*2(all in m). Ethanol forms a layer of 2mm. Ethanol vaporizes and diffuses through a stagnant film of air of thickness 2.5mm. What will be the time required for the water layer to disappear completely, if the floor has micro pores and water penetrates the floor at a constant rate of 0.1kg/m²h. The diffusivity of ethanol in air is 2.567*10⁻⁵ m²/s. The total pressure is 1.013 bar and the pressure of ethanol in bulk air is 0.02244 bar and at the ethanol-air interface is 0.02718bar. The temperature is 25.2°C.

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Q. The molar average velocity of the components in a binary mixture in which they are in equimolar counter diffusion is

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Q. A cylinder of sulfur is kept in a large volume of stagnant air for sublimation. How much time will be required for its complete sublimation?

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Q. For a gas mixture (A+B) equimolar counterdiffusion takes place. Which among the following statements are correct for molar flux?

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Q. Find the number of stages.

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Q. Find the process.

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Q. From the figure find the extract positions.

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Q. Find the number of stages.

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Q. Look at the operating line which represents?

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Q. Can we able to find the extract at the second stage with the known values of E1, R1, S2.

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Q. Find the value of extract percentage in the second stage.

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