1. Pure hydrogen at 2 atm absolute pressure and 27 0C (300 K), H2 gas flows over vulcanized neoprene rubber in the form of a hollow cylinder with r1=2.5 mm inner radius and r2=5 mm outer radius. Calculate the radial radial flow (kgmol/s) in the cylinder at steady state, using the data in the table 6.5.1 in your book. (Assume that there is no resistance to diffusion in the inner part of the rubber and that the partial pressure of the H2 gas is zero in this part. Assume the direction from the center of the cylinder outward, to the +r direction.)

2. At 278 K, the dimensions of a solid slice containing some agar gel are 10.16 mm in the x-direction, 7.62 mm in the y-direction, and 10.16 mm in the z-direction, with a uniformly distributed concentration of 0.1 kgmol/m3. contains. The spread occurs in three different directions. This solid slice is suddenly introduced into pure water in turbulent flow; that is, the convection coefficient kc is very large. The spreadability of urea in agar is 4.72 x 10-10 m2/s. After 10 hours, what will be the concentration at the midpoint of my tongue?

3. A counterflow-multistage equilibrium system shall be designed to absorb 83% of A using an aqueous solution from a gas mixture stream containing 8 kgmol% A component at 313 K and 1 atm pressure. The amount of gas mixture inflow is 30 kgmol/hr. The incoming aqueous solution contains 2% and the exiting aqueous solution contains 4.5% CO2.

Calculate L' (inert water), V' (inert gas), V1 (outgoing gas mixture amount), total inlet and outlet aqueous solution amounts (L0 and LN). With the help of the given information and the balance data below, find the theoretical number of steps graphically.

xA	yA
0,0250	0,0075
0,0350	0,0200
0,0400	0,0285
0,0450	0,0385
0,0525	0,0575
0,0560	0,0675
0,0600	0,0825