${{H}_{2}}O\,$ ના મોલ $=\,\,\frac{\text{0}\text{.72}}{\text{18}}\,\,=\,\,0.04;\,\,\,\,C{{O}_{2}}\,$ ના મોલ $=\,\,\frac{\text{3}\text{.08}}{\text{44}}\,\,=\,\,0.07$

$\begin{align}
   \because \,\,\,x\,\,:\,\,\frac{y}{2}\,\,=\,\,0.07\,\,:\,\,0.04 \\ 
  \Rightarrow \,\,x\,\,:\,\,y\,\,=\,\,0.07\,\,:\,\,0.08\,\,\,\Rightarrow \,\,7\,\,:\,\,8 \\ 
\end{align}$

$\because \,\,C$ અને $\text{H}\,\,$ વચ્ચેનો ગુનોતર $\text{x}\,\,\text{:}\,\,\text{y}$ છે 

$\therefore \,\,\text{C}\,\,\text{:}\,\,\text{H}\,\,=\,\,\text{7}\,\,\text{:}\,\,\text{8}$

તેથી હાઈડ્રો કાર્બન નું પ્રમાણ સૂત્ર ${{\text{C}}_{\text{7}}}{{\text{H}}_{\text{8}}}$ થાય છે