Объяснение:
Mr(K3PO4) = 39*3 + 31 + 16*4 =212
W(K) = Ar(K) *n / Mr(K3PO4) *100% = 39*3 / 212 *100% =55%
W(P) = Ar(P) *n / Mr(K3PO4) *100% = 31*1 / 212 *100% = 15%
W(O) = Ar(O) *n / Mr(K3PO4) *100% = 16*4 / 212 *100% =30%
1) 39×3+31+16×4=212 г/моль
2) (39×3)/212=0,55×100=55%
3)31/212=0.15×100=15%
4)(16×4)/212=0.3×100=30%