*v=c/λ λ = 3*10^8 m/s /1.97 *10^15 λ = 1.5 *10^-7 The calculated wavelength is in unit of meter. use the relationship between meter and nanometer to convert to the correct units.
Following the atomic mass of each of these atoms, we have 1 Fe atom with 56 amu, 3 N atoms with 14 each, and 9 O atoms with atomic mass 16. Adding these together, we get 56 + 42 + 144 = 144 + 98 = 242. Your answer is (4) 242 g/mol
