C₂H₅OH + a*O₂ + b*NH₃ --> c*CH_1.8O_0.5N_0.2 + d*CO₂ + e*H₂O + f*CH₃COOH

Acetic acid can be produced from ethanol by growing Acetobacter aceti in a solution containing ethanol as a substrate. The chemical composition of that bacterium is CH_1.8O_0.5N_0.2. The yield of biomass from the substrate is 0.25 g g^-1 and the yield of acetic acid from the substrate is 0.22 g g^-1. Using the reduction balance, calculate how many moles of oxygen are needed per mole of ethanol. Use as atomic weights here C=12 g/mol, H=1 g/mol, O=16 g/mol and N=14 g/mol), even though they are no exact values, so that the verification automation does not reject your answer.

So how many moles of oxygen are needed per mole of ethanol? Enter the answer to two decimal places.