Bioprocess Engineering Mass transfer - Example 12

Prof. Dr. Fensterle from the HSRW in Kleve demonstrates how to calculate the kla value in a steady state. The example is based on Pauline Doran, Bioptocess Engineering Principles, AP.
Note: in the video for calculating the N_A, the volume is missing (20L), as the formula is N_A = 1 / (R*V) ... The correct unit of R is atm K-1 mol-1.

[DrLiuResearchTIPS]

0.0114*82%=0.093, not 0.0977. It may be a mistake in the book. They assumed 21% O2 in the outlet gas flow in their calculation, but it is 20.1% in the problem.
You used the correct equations, but you used their wrong result.
The final KLa value should be 0.17 s-1, instead of 0.22 s-1 based on my calculation.

[wooyongkim]

For part (a), I think you forgot to divide volume which is 20L.