# Question 29.1: An exhaust stream from a semiconductor fabrication unit cont...

An exhaust stream from a semiconductor fabrication unit contains 3 mol % acetone and 97 mol % air. In order to eliminate any possible environmental pollution, this acetone-air stream is to be fed to a mass transfer column in which the acetone will be stripped by a countercurrent, falling 293 K water stream. The tower is to be operated at a total pressure of $1.013 \times 10^5 \mathrm{~Pa}$. If the combined Raoult–Dalton equilibrium relation may be used to determine the distribution of acetone between the air and the aqueous phases, determine

(a)    the mole fraction of acetone within the aqueous phase, which would be in equilibrium with the 3 mol % acetone gas mixture.
(b)    the mole fraction of acetone in the gas phase, which would be in equilibrium with 20 ppm acetone in the aqueous phase.

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Question: 29.4

## Awastewater stream is introduced to the top of a mass-transfer tower where it flows countercurrent to an air stream. At one point in the tower, the wastewater stream contains 1 × 10^-3 g mol A/m³ and the air is essentially free of any A. At the operating conditions within the tower, the film ...

At the specified plane, c_{A, L}=1.0 \times...
Question: 29.2

## The Henry’s law constant for oxygen dissolved in water is 4.06 × 10^9 Pa/(mol of O2 per total mol of solution) at 293 K. Determine the solution concentration of oxygen in water that is exposed to dry air at 1.013 × 10^5 Pa and 293 K. ...

Henry's law can be expressed in terms of the mole ...
Question: 29.3