and $C{H}_4($Equation $(2)).$ Hydrogen yield $({}_{H2})$ is defined in

Equation $(3)$ where $R$ is the $\frac{H_2}{C}{O}_2$ reforming ratio of $\frac{7}{3}$ for

glycerol. This ${}_{H2}$ definition takes into account that $4H_2$

molecules come from one molecule of glycerol whereas $3$

molecules of $H_2$ proceed from water.

$x_G^t=\frac{F_G^{\text{I}}-F_G}{F_G^{\text{I}}}100$

$x_G^g=\frac{{\displaystyle \underset{?}{\overset{?}{}}}{}_i*F_i}{{}_G*F_G^{\text{I}}}100$

${}_{H2}=\frac{F_{H2}}{F_G^{\text{I}}}\frac{1}{R}100$

Can someone explain to me why the hydrogen yield in this given formula in the study is stoichiometrically adjusted? It was expressed in percent in the study, but I don't understand how to make sense of it$.$ I need it to make a material balance equation for a plant design.