= Faradaic efficiency
{c}
{title2=$\eta_F$}
<Faradaic efficiency> is the fraction of total transferred <electric charge> accounted for by a specified product. If production of one mole requires $z$ moles of <electrons>, then $\eta_F=zFn_{\rm product}/Q$, where $F$ is the <Faraday constant> and $Q$ is the measured charge.
For example, two-electron formation of one millimole of product accounts for approximately 193 coulombs. Dividing that charge by the total passed charge gives its <Faradaic efficiency>. The value differs from <chemical yield>, which compares product amount with a starting-material inventory.
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