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Prior to liquefaction, air is dried by contacting it with dry silica gel adsorbent. The air entering the dryer with 0.003 kg water/kg dry air must be dried to a minimum water content of 0.0005 kg/kg dry air. Using the equilibrium data below, calculate the kg gel per kg dry air required for the following.

(a) A single-stage batch contactor.

(b) A two-stage countercurrent system.

(c) A two-stage crossflow contactor with equally divided adsorbent flows.