Chapter 17, Problem 17.107SP

Interpretation Introduction

Interpretation:

The constant current (in amperes) that is required to produce aluminium by Hall-Heroult process has to be calculated.

Concept Introduction:

Constant Current:

The number of coulombs of charge passed through the cell is equal to the product of current in amperes (coulombs per second) and time in seconds.  The constant current is calculated using the formula,

$\text{Charge(C)}\text{=}\text{Current(A)×Time(s)}$

Moles of Electrons:

The charge on one mole of electrons is $\text{96,500}\text{C,}$ and the number of moles of electrons passed through the cell is calculated as,

$\text{Moles}\text{of}{\text{e}}^{\text{-}}\text{=}\text{Charge(C)×}\frac{\text{1}\text{mole}{\text{e}}^{\text{-}}}{\text{96,500}\text{C}}$