rate of 1.0 kg/ In a packed tower, a gas mixture with a 0.015 mole fraction of solute S at the inlet (the remainder being inert gases) undergoes counter- current absorption with water. The desired outlet concentration of the solute is 1% of its inlet concentration. The gas enters at a total flow /m²-s Given the dilute nature of the system, the equilibrium condition follows Henry's Law, represented by y = 1.75x, where y and x denote the mole fractions of solute S in the vapor and liquid phases, respectively. The column is packed with a material that yields an overall gas-phase mass transfer coefficient (Kya) of 0.06 kg-mole m³ smole fraction The tasks are to calculate: kg m2.s (molecular weight = 29), and pure water is introduced at a rate of 1.6 (a) the required height of the packing for the separation, and (b) the minimum rate of liquid needed for the separation. Additionally, it is asked how the required packing height would change if a different packing type with a Kya of kg-mole 0.04 adjusted to 5% of the inlet value. ole/m³.. m3. s mole fraction is used, and what the outcomes would be if the outlet gas solute concentration requirement is

7-31. In the air dryer illustrated in Figure 7.31, part of the effluent air stream is to be recycled in an effort to control the inlet humidity. The solids entering the dryer (Stream #3) contain 20 % water on a mass basis and the mass flow rate of the wet solids entering the dryer is 1000 lb/h. The dried solids (stream 4) are to contain a maximum of 5 % water on a mass basis. The partial pressure of water vapor in the fresh air entering the system (Stream #1) is equivalent to 10 mm Hg and the partial pressure in the air leaving the dryer (Stream #5) must not exceed 200 mm Hg. In this particular problem the flow rate of the recycle stream (stream #6) is to be regulated so that the partial pressure of water vapor in the air entering the dryer is equivalent to 50 mm Hg. For this condition, calculate the total molar flow rate of fresh air entering the system (Stream #1) and the total molar flow rate of the recycle stream (Stream #6). Assume that the process operates at atmospheric pressure…

4) For workers in closed spaces, it is a great danger to consuming the breathable air (oxygen) and replacing it with carbon dioxide (CO₂) is great danger issue. In order to avoid breathing this harmful gas, closed areas should be adequately ventilated. There is no specific standard for the air exchange rate. However, a complete freshening of air every 2.5 minutes has been accepted by the industry as effective ventilation. A worker maintains a rectangular tank with a height of 10 ft and a 5 ft x 5 ft square bottom. Fresh air enters through a 6-inch diameter hose and exits through a 3-inch diameter port on the tank wall. The flow is assumed to be incompressible and steady. Determine, a) The exchange rate required (ft³/min) for this tank. b) The velocity of the air entering and exiting the tank at this exchange rate.

Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq).Calculate the amount of Ga(s) that can be deposited from a Ga(III)solution using a current of 0.460 A that flows for 40.0 min.   mass:               g