First slide

Faraday's Laws

Question

When 3.86 amperes current are passed through an electorlyte for 50 minutes, 2.4 grams of a divalent metal is deposited. The gram atomic weight of the metal (in grams) is

Moderate

Solution

From Faraday's law
$m = \frac{{Ait}}{{n \times 96500}} \Rightarrow A\left( {GAW} \right) = \frac{{m \times n \times 96500}}{{it}} = \frac{{2.4 \times 2 \times 96500}}{{3.86 \times 50 \times 60}} = 40$

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