A biological reactor is getting wastewater containing 1 mole/L acetate ions as carbon source. The following reaction takes place in the bio-reactor:
\[
0.125CH_3COO^- + 0.0295NH_4^+ + 0.103O_2 \;\;\Rightarrow\;\; 0.0295C_5H_7O_2N + 0.0955H_2O + 0.095HCO_3^- + 0.007CO_2
\]
Assume that all acetate ions are consumed and ammonia serves as a nutrient source.
Given that 1 g acetate exerts 1.07 g COD; 1 mole bacteria = 113 g VSS; 1 mole acetate ion = 59 g.
Value of observed yield is ________________________ (in g VSS/g COD, rounded off to two decimal places).