Объяснение:
Mr(FeO) = 56+16=72
W(Fe) = Ar(Fe) *n / Mr(FeO) *100% = 56 *1 / 72 *100% =78%
W(O) = Ar(O) *n / Mr(FeO) *100% = 16*1 / 72 *100% =22%
Mr(P2O5) = 31*2 + 16*5 = 142
W(P) = Ar(P)*n / Mr(P2O5) *100% = 31*2 / 142 *100%=44%
W(O) = Ar(O) *n / Mr(P2O5) *100% = 16*5 / 142 *100% = 56%
Mr(Na2CO3) = 23*2 + 12 + 16*3 = 106
W(Na) = Ar(Nа) *n / Mr(Na2CO3) *100% = 23*2 / 106 *100% = 43%
W(C) = Ar(C) *n / Mr(Na2CO3) *100% = 12*1 / 106 *100% = 11%
W(O) = Ar(O) *n / Mr(Na2CO3) *100% = 16*3 / 106 *100% =46%
Mr(Al2(SO4)3) = 27*2 + 32*3 + 16*12 = 342
W(Al) = Ar(Al) *n / Mr(Al2(SO4)3 *100% = 27*2 / 342 *100% = 16%
W(S) = Ar(S) *n / Mr(Al2(SO4)3 *100% = 32*3 / 342 *100% = 28%
W(O) = Ar(O) * n / Mr(Al2(SO4)3 *100% = 16*12 / 342 *100% = 56%
