question_answer 29)

How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain. 

Answer:

                Edge of the cubic crystal in the unit cell = a pm Volume of the unit cell a3 (pm)3 = a3 x 10-30 cm3 Density of the unit cell Mass of the unit cell = No. Volume of the unit cell × mass of each atom or Mass of each atom,  Density of unit cell (d) The density of unit cell is equal to the density of the substance. If the density of the substance is known by other methods, then we can calculate the atomic mass of unknown metal by the formula