How many Faradays of electricity are required to deposit 10 g of calcium from molten calcium chloride using inert electrodes? (Molar mass of calcium = `40g mol^-1)`

Options

A. `0.5F`
B. 1F
C. `0.25F`
D. 2F

Answer

A

Explanation

n=10/40 mol = 0.25 mol

`Ca^(+2) + 2e^(-) -> Ca`




For 1 mole, 2e- = 2F of electricity


So, for 0.25 mole, 0.25x2 F = 0.5 F