At equilibrium the concentration of water in vapour phase (C * )in kg/m 3 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 100m 3 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

• A. 0.0
• B. 0.2
• C. 0.4
• D. 1.0