A biological reactor is getting wastewater containing 1 mole/L acetate ions as carbon source. The following reaction takes place in the bio-reactor:
\[
\begin{array}{l}
0.125 \mathrm{CH}_{3} \mathrm{COO}^{-}+0.0295 \mathrm{NH}_{4}^{+}+0.103 \mathrm{O}_{2} \rightarrow 0.0295 \mathrm{C}_{5} \mathrm{H}_{7} \mathrm{O}_{2} \mathrm{~N}+0.0955 \mathrm{H}_{2} \mathrm{O}+ \\
0.095 \mathrm{HCO}_{3}^{-}+0.007 \mathrm{CO}_{2}
\end{array}
\]
Assume that all acetate ions are consumed and ammonia serves as a nutrient source. Given that $1 \mathrm{~g}$ acetate exerts $1.07 \mathrm{~g}$ COD; 1 mole bacteria $=113 \mathrm{~g}$ VSS; 1 mole acetate ion $=59 \mathrm{~g}$. Value of observed yield is ____________ (in $\mathrm{g} \mathrm{VSS} / \mathrm{g}$ COD, $\text{rounded off to two decimal places).}$
