help with these please

Question-3. Given that Pt has an FCC crystal structure, density (P) = 21.45 g/cm', atomic mass (An) = 195.084 g/mol, Avogadro constant (NA) * 6.022 * 102 atoms/mol. Calculate the radius of the Pt atom. (6 points) Question-6. The figure below is the X-ray diffraction (XRD) pattern of Nb, which has a BCC crystal structure. A monochromatic X-ray with a wavelength (a) of 0.1542 nm was used. The reflection order is 1. (10 points): (a) Calculate the lattice spacing for the (110) plane from the XRD spectrum. (4 points) (b) Calculate the lattice parameter of Nb. (3 points) (c) What is the atom packing fraction (APF) of Nb? (3 points) 8000 (110)ND 38.3 6000 Intensity 4000 69.3 55.39 (211)Nb 2000 (200)ND 82.1 (229)ND 20 30 40 70 80 50 60 20 degree 90