Объяснение:
Mr(P2O5) = 31*2 + 16*5 = 142
W(O) = Ar(O) *n / Mr(P2O5) *100% = 16*5 / 142 *100% =56 %
Mr(H3PO4) = 1*3 + 31 + 16*4 = 98
W(O) = Ar(O) *n / Mr(H3PO4) *100% = 16*4 / 98 *100% = 65%
Объяснение:
Mr(P2O5) = 31*2 + 16*5 = 142
W(O) = Ar(O) *n / Mr(P2O5) *100% = 16*5 / 142 *100% =56 %
Mr(H3PO4) = 1*3 + 31 + 16*4 = 98
W(O) = Ar(O) *n / Mr(H3PO4) *100% = 16*4 / 98 *100% = 65%