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Topic: How to calculate the theoretical specific capacitance of a zinc–carbon battery  (Read 2334 times)

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Akutni

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How to calculate the theoretical specific capacitance of a zinc–carbon battery
« on: February 04, 2023, 10:24:13 AM »
Hello,
I should calculate the specific capacitance of a zinc–carbon battery.
I've found it can be calculated by this formula: C = nF/M derived from the Faraday's law. “n” should be the number of electrons which, on the basis of the anode reaction, should be 2. “F” is a constant (F = 96 485,332 123 310 018 4 C•mol¯¹). But I don't know which molar mass I should put there. Should it be the molar mass of zinc or zinc + carbon or zinc + carbon + electrolyte?

Anode: Zn + 2NH4Cl → [Zn(NH3)2]Cl2 + 2H+ + 2e−
Catode: 2 MnO2 + 2 NH4Cl + 2e− → Mn2O3 + 2 NH3 + H2O + 2 Cl−

Thank you for your answers.

Hunter2

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Re: How to calculate the theoretical specific capacitance of a zinc–carbon battery
« Reply #1 on: March 01, 2023, 08:42:41 AM »
Develop both half reaction.
You need Zn／zZ2+ and MnO2/Mn2O3
Carbon is only carriwr and is not needed