Find the equilibrium separation distance between the Na+ and F− ions in an NaF crystal. Use a value of 41.99 g/mol for the molar mass of NaF and use a value of 2.56 g/cm3 for the density of an NaF crystal.
The separation between hydrogen atoms in a H2 molecule is about 0.075 nm. Determine the characteristic energy of rotation in eV. Use a value of Js for the value of the Reduced Planck Constant, and a value of 931.5 MeV/c2 for the value of the unified atomic mass unit.