İ heard that : Charge of a mole of electrons/charge of single electron =avagadros constant How is this derived ?
-
$\begingroup$ What is a mole, come to think of it? $\endgroup$– Ivan NeretinJan 21, 2018 at 20:34
-
$\begingroup$ Charge of a mole of electrons is the Faraday electrolysis constant. So the Avogadro constant can be measured in an electrolysis experiment. $\endgroup$– Zhuoran HeJan 22, 2018 at 0:01
2 Answers
The key is to determine the charge of a mole of electrons vs the charge of one electron.
We get the charge of one electron from the Milliken oil drop experiment.
For a mole of electrons you can start uf you firzt get the molar mass of water, call this $18.016$ grams per mole. Now electrolyze water with an inert electrolyte such as sodium sulfate. Work out the charge transfer required to decompose one mole = $18.016$ grams. This is two moles of electrons based on the stoichiometry of the electrochemical reaction. Half of this divided by the single electron charge is Avogadro's number.
I believe it is the number of carbon atoms in 12 grams.
-
-
1$\begingroup$ OP meant his specific calculation with electrons. $\endgroup$– MithoronJan 21, 2018 at 21:57