Question 5 Tungsten is a solid phase of tungsten still unknown to science. The only difference between it and ordinary tungsten is that Tungsten forms a crystal with an fcc unit cell and a lattice constant . Calculate the density of Tungsten .

Complete Question

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The density is  

Explanation:

From the question we are told that

      The lattice constant is  

Generally the volume of the unit cell is  

                                                             =>  

Converting to     We have  

The molar mass of Tungsten is constant with a value  

One mole of Tungsten contains   unit cells

    Where  is  a constant for the number of atom in one mole of a substance(Tungsten) which is known as Avogadro's constant

      Now for FCC distance  the number of atom per unit cell  is  n =  4

               Mass of Tungsten (M) =  

=>              Mass of Tungsten (M) =  

=>              Mass of Tungsten (M) =  

 Now  

      The density of  Tungsten is  

substituting values