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Mass Transfer
Diffusion
GATE 2016
Hard

For a binary ideal-gas mixture A-B (total P=100kPa), pA=10kPa and 5kPa at two points 10mm apart. Case 1: A diffuses through stagnant B. Case 2: equimolal counter-diffusion. The ratio of molar flux of A in Case 1 to Case 2 is

  • A0.58
  • 1.08
  • C1.58
  • D2.18

Explanation

Case1/Case2 ratio = P/pBM, where pBM=log-mean of pB1=90,pB2=95=(95−90)/ln(95/90)=92.48. Ratio=100/92.48=1.08.

Source: GATE CH 2016 (2016)

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