Determine the mass of ammonia transferred in 30 minutes, diffusing in a circular pipe of diameter 20 inches, using the equation below. Wall concentration is 0.1332 lbmol/ft3 while the bulk fluid is 0.9558 lbmol/ft³. [A is cross sectional area, t is time, NNH,is the number of moles of ammonia transferred NNH3 = kA(CNH3 bulk - CNH3 wall)t

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Steady State Model

The steady-state model typically states that the entire universe is always enlarging, although it balances a fixed average density and matter that is being constantly generated to make new galaxies, star forms at a similar rate that the previous ones get indistinguishable due to the growing range and velocity of recession.