Add on NaCl post

one cube of salt =.7mm
5.49153314E 16 NaCl in one salt cube

.543 nm in a unit cell, 1,000,000 nm=1mm,  543,000 nm in 1mm cube of salt.  our cube of salt .77mm.  therefore, 543nm*.7mm =380,100nm.  we now have to cube it to get the volume.  380,000^3 =5.49153314E 16