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Consider steady state mass transfer of a solute $A$ from a gas phase to a liquid phase. The gas phase bilk and interface mole fractions are $y_{A,G}$ and $y_{A,i}$, respectively. The liquid phase bulk and interface mole fraction are $x_{A,L}$ and $x_{A,t}$, respectively. The ratio $\frac{\left ( x_{A,i}-x_{A,L} \right )}{\left ( y_{A,G}-y_{A.t} \right )}$ is very close to zero.

This implies that mass transfer resistance is

  1. negligible in the gas phase only
  2. negligible in the liquid phase only
  3. negligible in both the phases
  4. considerable in both the phases 
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