The object with dimensions
and with mass 250.6 g will have a density equal to
.
<h3>
<u>Explanation:</u></h3>
<u>Given:</u>
Dimensions of the object =
length = l = 5.54 cm
width = w = 10.6 cm
height = h = 199 cm
Mass of the object = m = 250.6 g
<u>Formula:</u>
The relation between density, mass and volume of any object is given by:

Since volume of an object with length (l), width (w) and height (h) [assuming a rectangular object] can be defined as,




Density of the object is 
The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it. Aluminium oxide has a very high melting point (over 2000°C) so it would be expensive to melt it. The use of cryolite reduces some of the energy costs involved in extracting aluminium.
the two process that occur in a cell are
oxidation: this is loss of electron by electrode. the metal electrode loaes electrons and get oxidized and forms ions
the ions get migrated to solution
Reduction: here the ions present in solution gains electron and get deposited on electrodes.
so gain of electrons is by ions
electrode gains electrons is where reduction occurs, and the half cell in which the electrode loses electrons is where oxidation occurs.