Объяснение:
Mr(Cu2O) = 64*2 + 16 = 144
W(Cu) = Ar(Cu) *n / Mr(Cu2O) *100% = 64*2 / 144 *100% = 89%
W(O) = Ar(O) *n / Mr(Cu2O) *100% = 16*1 / 144 *100% = 11%
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(SO3) = 32 + 16*3 = 80
W(S) = Ar(S) *n / Mr(SO3) *100% = 32*1 / 80 *100% = 40%
W(O) = Ar(O) *n / Mr(SO3) *100% = 16*3 / 80 *100% = 60%
Mr(NO2) = 14+16*2 =46
W(N) = Ar(N) *n / Mr(NO2) *100% = 14*1 / 46 *100% = 30%
W(O) = Ar(O) *n / Mr(NO2) *100% = 16*2 / 46 *100% = 70%
