Question

How much electricity in terms of Faraday is required to produce $100g$ of $Ca$ from molten $CaC{l}_2$ ?

• A. $1F$
• B. $2F$
• C. $3F$
• D. $5F$

Answer 1

Answer: (D)

$CaC{l}_2\to C{a}^{2+}+2C{l}^{-}$
$C{a}^{2+}+\underset{\text{2 moles}}{2e^{-}}\to \underset{\text{1 mol (40 g)}}{\mathrm{Ca}}$
$40g$ of $Ca\equiv 2F$
$100g$ of $Ca\equiv 5F$