When silvering the items, they used a current of 5 A for 15 minutes. How much silver was consumed during this time?

We translate the values from given to the SI system:
Δt = 15 min = 900 s.
According to the first Faraday’s law, the mass of a substance that was released on the electrode during the time Δt at a current strength I is proportional to them.
m = k * I * Δt, where k is the electrochemical equivalent of a substance (the ratio of the mass of an ion to its charge)
The electrochemical equivalent of a substance according to the reference book for silver is k = 1.118 * 10 ^ -6 kg / C.
Let’s plug in the numbers and find the mass:
m = k * I * Δt = 1.118 * 10 ^ -6 * 5 * 900 = 0.005 kg.
Answer: 0.005 was spent. silver or 5g.