Question

A metal body of mass 81 g occupies a volume of 30 cm3. Identify the metal.

Answer 1

Answer:

Aluminum

Explanation:

The density of Aluminum is 2.7 g/cm3

We know the volume and mass of the unknown metal, as density is mass/volume:  81g/30cm3 = 2.7 g/cm3 which is the density of Aluminum :)

Answer 2

Given parameters:

Mass of metal  = 81g

Volume of metal  = 30cm³

Unknown:

Identity of the metal = ?

To find the identity of the metal, we must derive an intrinsic property from the give parameters which we can use to identify it.

This property is density.

Density is mass per unit volume of a substance. Every earth material has a unique value of density.

         Density  = $\frac{Mass}{Volume}$

  If we find density, we look up a density table and identify the element.

Input the parameters and solve;

        Density  = $\frac{81}{30}$    = 2.7g/cm³

The metal with a density value of 2.7g/cm³ is aluminium.