KCl
W(K) = Ar(K) *n / Mr(KCl) *100% = 39 *1 / 72,5 *100% = 53,79%
W(Cl) = Ar(Cl) * n / Mr(KCl) *100% = 35,5 *1 / 72,5 *100% = 48,96%
KNO3
W(K) = Ar(K) * n / Mr(KNO3) *100% = 39 * 1 / 101 *100% = 38,61%
W(N) = Ar(N) * n / Mr(KNO3) *100% = 14 * 1 / 101 *100% = 13,86%
W(O) = Ar(O) * n / Mr(KNO3) * 100% = 16 *3 / 101 * 100% = 47,52 %