Ammonia ( A ) is diffusing through nitrogen ( B ) under steady - state Conditions . The total pressure is 1.013 × 10³ Pa and the temperature is 298 K. The partial pressure of NH3 at one point is 1.333 * 10 Pa and at the other point 20 mm away . it is 6.666 * 18 Pa . The DAB for the mixture is 2.30 105 m² . ) Derive an equation to predict the flux of NH3 as a function in partial pressules of gases . for equimolar Counter diffusion . Calculate the flux of NHS in Vgmal / s - m² for equimolar Counter diffusion ... iii ) Assume №₂ nondiffusing , estimate the flux of NH3 in Kgmol / 5 - m² .