Decomposition efficiency ($\eta _{D}$) of an electrolytic cell used for producing $NaOH$ is defined as
- $\eta _{D}$ = (grams of $NaOH$ produced / grams of $NaCl$ decomposed) $\times$ 100
- $\eta _{D}$ = (grams of $NaOH$ produced / grams of $NaCl$ charged) $\times$ 100
- $\eta _{D}$ = (gram equivalents of $NaOH$ produced / gram equivalent of $NaCl$ charged) $\times$ 100
- $\eta _{D}$ = (theoretical current to produce one gram equivalent / actual current to produce one gram equivalent) $\times$ 100