Question

1. (a) For the diffusion of solute A through a layer of gas to an absorbing liquid, where the initial mole fraction (yAo) is 0.10 and the final mole fraction (yA) is 0.20. What is the transfer rate for one way diffusion? How does this compared to equimolar diffusion? (b) What is the value of the final mole fraction yA halfway through the layer if it is one way diffusion?

2.An open circular tank is 8 m in diameter contains n-propanol at 25°C exposed to the atmosphere in such a manner that the liquid is covered with stagnant air film estimated to be 5 mm thick. The concentration of propanol beyond the stagnant film is negligible. The vapor pressure of propanol at 25°C is 20 mm Hg. If propanol is worth $1.20 per liter. What is the value of the lost of propanol from this tank in dollars per day? The specific gravity of propanol is 0.80.

Answer 1