1. The gas CO2 (A) is diffusing at steady state through a tube 0.20 m long having a diameter of 0.01m and containing N2 (B) at 298 K. The total pressure is constant at 101.32 kPa. The partial pressure of CO2 at one end is 456 mm Hg and 76 mm Hg at the other end. The diffusivity DAB is 1.67 x 10-5 m/s at 298 K. Calculate the flux of CO2 for equimolar counter diffusion. 2. Ammonia gas is diffusing through N2 under steady state conditions with N2 non-diffusing since it is insoluble in one boundary. The total pressure is 1.01325 x 109 Pa and the temperature is 298 K. The partial pressure of NH3 at one point is 1.333 x 104 Pa and at the other point 20 mm away it is 6.666 x 103 Pa. If DAB at 1.01325 x 10$ Pa and 298 K is 2.30 x 10-5, calculate the flux of NH3. 3. In a steelmaking process using molten pig iron that contains carbon, a spray of molten iron particles containing 4.0 wt% carbon falls through a pure-oxygen atmosphere. The carbon diffuses gas stream at point 1 to a catalyst surface at point 2 and reacts instantaneously and irreversibly as follows: 2AB Gas B diffuses back to the gas stream. Derive the final equation for NA at constant pressure P and steady state in terms of partial pressures, diffusivity DAB