1. Platinum crystallized as face centred cubic density of 21.40 g/cm and atomic weight of 195.10 g/mol. Given that the Avogadro's number is 6.023 x1023 atoms/mol, determine the lattice parameter and atomic radius of platinum atom. (6 marks) 2. Distinguish between proeutectoid ferrite and eutectoid ferrite. A plain carbon steel containing 0.65 percent C is slowly cooled from 950 C to a temperature just above 727 C. Calculate the relative amount of proeutectoid ferrite and austenite in this steel (6 marks)