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# How would I calculate the number of electrons passing through the cathode? watch

1. I also need to calculate the total number of silver atoms from it.

I know the current (0.12 A) the time (1200s) The charge (144C) and Change in mass (0.14g)
3. (Original post by Ukvoltaire)
I don't know how to do it this is just one of the 5 I need to work out. I wanted to find out how to do one then the other 4 I'll do on my own. The other 4 have different charges, Amps and change in weight. Could you just give me a formulae to work it out we weren't taught this.
4. (Original post by Balkaran)
I also need to calculate the total number of silver atoms from it.

I know the current (0.12 A) the time (1200s) The charge (144C) and Change in mass (0.14g)
The elementary electric charge carried by an individual electron is:

Each Coulomb of charge therefore has:

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