The overall stoichiometry for an aerobic cell growth is

$3 \text{C}_{6} \text{H}_{12} \text{O}_{6} + 2.5 \text{NH}_{3} + \text{O}_{2} \rightarrow 1.5 \text{C}_{a} \text{H}_{b} \text{O}_{c} \text{N}_{d} + 3\text{CO}_{2} + 5\text{H}_{2} \text{O}$

What is the elemental composition formula of the biomass?

1. $\text{C}_{9} \text{H}_{18.2}\text{O}_{5}\text{N}_{1.667}$
2. $\text{C}_{9} \text{H}_{22.33}\text{O}_{6}\text{N}_{1.667}$
3. $\text{C}_{10} \text{H}_{18.2}\text{O}_{5}\text{N}_{1.667}$
4. $\text{C}_{10} \text{H}_{22.33}\text{O}_{6}\text{N}_{1.667}$