Show the relation between electro-chemical equivalent (z) and chemical equivalent weight of the element (e) using the faraday's laws of electrolysis.

Explanation:

Let us assume W1 g of a substance and W2 g of another substance are produced at two different electrodes when same quantity of electricity is passed through them.

if two elements have their respective electro-chemical equivalents Z1 and Z2 and their corresponding chemical equivalents are E1 and E2.

Then according to Faraday's first law,

Divide eq.(1) by eq.(2)

and according to Faraday's second law,

Divide eq.(4) by eq.(5)

From equation (3) and (6) we get,

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definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.