Question

Проводится процесс рафинирования Zn с примесями Mg и Cu в растворе серной кислоты (pH=1). Расcчитайте массу цинка, которая выделится на катоде за 3 часа при силе тока 2 А и выходе металла по току 60%.

Answer 1

Дано:
ω(С) = 83,3 процента
ω(H) = 11,7 процентов
Дh2 = 36
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формула - ?

Решение:
1)М(СхHy) = Дh2 * М(H2) = 36*2 = 72 г/моль
2) С =( 72*0,833)/12 = 5
3) H = (72* 0,117)/1 = 8
Ответ: C5H8 

Answer 2

Calculation of Zinc Deposition on the Cathode

To calculate the mass of zinc that will be deposited on the cathode in 3 hours with a current of 2 A and a metal yield of 60%, we need to consider the Faraday's law of electrolysis.

According to Faraday's law, the amount of substance deposited on the cathode is directly proportional to the amount of electricity passed through the electrolyte. The relationship is given by the equation:

m = (Q * M) / (n * F)

Where: - m is the mass of the substance deposited on the cathode - Q is the total charge passed through the electrolyte (Q = I * t, where I is the current and t is the time) - M is the molar mass of the substance - n is the number of electrons involved in the reduction reaction - F is the Faraday constant (F = 96,485 C/mol)

In this case, we are considering the deposition of zinc (Zn) on the cathode. The reduction reaction for zinc is:

Zn^2+ + 2e^- -> Zn

The number of electrons involved in this reaction is 2.

Given that the current is 2 A and the time is 3 hours (which is equivalent to 10800 seconds), we can calculate the total charge passed through the electrolyte:

Q = I * t = 2 A * 10800 s = 21600 C

Now, we need to find the molar mass of zinc (Zn). According to the periodic table, the molar mass of zinc is approximately 65.38 g/mol.

Substituting the values into the equation, we can calculate the mass of zinc deposited on the cathode:

m = (Q * M) / (n * F) = (21600 C * 65.38 g/mol) / (2 * 96,485 C/mol) = 14.68 g

Therefore, the mass of zinc that will be deposited on the cathode in 3 hours with a current of 2 A and a metal yield of 60% is approximately 14.68 grams.

Please note that this calculation assumes ideal conditions and does not take into account any other factors that may affect the deposition process.