How much potassium is in WHAT compound?? KCl for example is a salt made up of K (potassium - atomic weight 39.0983) and Cl (Chlorine - Atomic weight 35.45) so the fraction of K in any given sample would be 39.0983/(39.0983 + 35.45) = .524469 Potassium( K)
Do you know what compound we are concerned about how much K it contains?
~jc
