If the fluoride is consumed as sodium fluoride (45.24% f), what amount of sodium fluoride contains the recommended amount of fluoride?

I looked up the recommended amount of fluoride that should be taken in by adults and the average amount is 3.45 g. The amount of sodium fluoride that must be taken in is calculated by,
   recommended amount of fluoride = (amount of sodium fluoride) x 0.4524
Substituting,
           3.45 g = amount of sodium fluoride x 0.4524
The amount of sodium fluoride is equal to 7.63 g. 

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf