Whose law states that the masses of different substances deposited or liberated by the same quantity of electric charge are proportional to their chemical equivalent weights?

Explanation

This is Faraday’s second law of electrolysis. For the same electric charge, the mass deposited or liberated is proportional to M/z, the chemical equivalent weight, where M is molar mass and z the number of electrons involved per entity. It concerns mass rather than an unspecified count of particles.