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A recycle-free absorber removes a solute from a gas into a liquid. The balance that is usually written first is

  • A.on the solvent, which may partly evaporate
  • B.on the carrier gas, passing through unchanged
  • C.on the solute, which appears in all four streams
  • D.on the total mass of all streams

Answer: B

The carrier gas is inert and appears in only two streams, which makes it the natural tie component. The solute is the species of interest but its balance carries the most unknowns. Solving the easy balance first exposes the harder one.

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