Question

**Ammonia gas is diffusing through N2 under steady-state
conditions with N2 nondiffusing since its insoluble in one
boundary. The total pressure is 1.013 x 104 Pa and the temperature
is 298 k. The partial pressure of NH3 at one point is 1.333 Pa and
at the other point 20 mm away it is 6.666 x 103 Pa. The DAB for the
mixture at 1.013 x 105 Pa and 298 K is2.30 x 10-5 m2/s. a)
Calculate the flux of NH3 in kg mol/s.m2. b) Do the same as (a) but
assume that N2 also diffuses; i.e., both boundaries are permeable
to both gases and the flux is equimolar counterdiffusion. In which
case is the flux greater?**

Answer #1

Ammonia gas (A) is diffusing at steady-state through N2 (B) by
equimolar counter-diffusion in a circular conduit 1.22 m long at 25
degrees celsius and a total pressure of 101.32 kPa absolute. The
partial pressure of ammonia at the left end is 25.33 kPa and 5.066
kPa at the other end. The conduit has a diameter of 0.0305 m at the
left end and tapering uniformly to 0.0610 m at the right end. The
diffusivity is 0.023 x 10–4 m2...

Methane diffuses at steady state through a tube containing
helium for the case equimolar counter diffusion. At point 1, the
partial pressure of methane is 55 kPa and at point 2, 0.03 m apart
is 15 kPa. The total pressure is 101.325 kPa and temperature is 298
k, at this temperature and pressure the value of diffusivity is
6.75 × 10-5 m2 /s. Calculate (a) the steady state flux of methane
from point 1 to point 2 (b) the partial...

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