Question

When Thomas Edison first sold electricity, he used zinc coulometers to measure charge consumption. (In a coulometer the cathode is weighed before a current is passed through it, and then again after the passage of current. The weight increase is proportional to the amount of current that flows through the cathode.) If the zinc plate in one of Edison's coulometers increased in mass by 14.47 g, how much charge had passed through it

Answer 1

Answer:

The answer is "$42537.93 \ C$".

Explanation:

Molar mass : $Z_n = 65.38 \ \frac{g}{mol}$

$\to Zn^{2+} + 2e^{-} = Zn$

$\therefore\\\\ \to 65.38 \ g \ of\ Z_n \ require: \\\\ \to 2 \times 96500\ C\\\\\to 14.41 \ g\ require,\\\\ \to \frac{(14.41 \times 2 \times 96500)}{65.38} \ \frac{g}{mol} = 42537.93 \ C$