At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?

Question

Accepted Answer

0.4. Option C is correct because the initial water mass divided by the total capacity of the desiccant determines the remaining fraction. Option A is incorrect because some water will remain in the air space. Option B is incorrect because it does not represent the calculated equilibrium state. Option D is incorrect because all the water vapor will not be removed.