Question

1) (8 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth. Myth has a molecular formula of AxBy, adopts an cubic arrangement of atoms as shown on the left. Find out how many atoms are present in each unit cell. a) Determine the molecular formula of myth. b) Calculate the atomic packing factor (APF) of the given arrangement. The atomic radii of A (red) and B (blue) are equal to 120 and 132 pm, respectively. c) Calculate the density of the myth molecule in g/cm. The atomic masses of A and 8 are equal to 58 and 60 g.mol, respectively. N- 6.02x10 atoms (Hint: lattice cell parameter is not given but you may calculate it by using a particular direction d) Determine the coordination numbers of A and B e) Calculate the planar densities (in atoms/nm2) of the following the crystallographic planes (222), (110), (111), and (002). f Draw any other unit cell with the same atomic arrangement, where corners of the cell are occupied by A atoms

Answer 1