Mr(K2O) = 39*2 + 16 = 94
W(O) = Ar(O) *n / Mr(K2O) *100% = 16 *1 / 94 *100% =17%
Mr(Al(OH)3 = 27 + 16*3 + 1*3 = 78
W(O) = Ar(O) *n / Mr(Al(OH)3) *100% = 16 * 3 / 78 *100% = 61,5%
Mr(K2O) = 39*2 + 16 = 94
W(O) = Ar(O) *n / Mr(K2O) *100% = 16 *1 / 94 *100% =17%
Mr(Al(OH)3 = 27 + 16*3 + 1*3 = 78
W(O) = Ar(O) *n / Mr(Al(OH)3) *100% = 16 * 3 / 78 *100% = 61,5%