Определите массовые доли элементов в следующих соединения буква б

Объяснение:

Mr(Na2O) = 23*2+16 = 62

W(Na) = Ar(Na) *n / Mr(Na2O)  *100% = 23*2 / 62  *100% =74%

W(O) = Ar(O) *n / Mr(Na2O)  *100% = 16 *1 / 62  *100% =26%

Mr(SrO) = 88 + 16 =104

W(Sr) = Ar(Sr) * n / Mr(SrO)  *100% = 88 *1 / 104  *100% =85%

W(O) = Ar(O) *n / Mr(SrO)  *100% = 16*1 / 104  *100% =15%

Mr(Al2O3) = 27*2 + 16*3 = 102

W(Al) = Ar(Al) *n / Mr(Al2O3)  *100% = 27*2 / 102  *100% =53%

W(O) = Ar(O) *n / Mr(Al2O3)  *100% = 16*3 / 102  *100% =47%

Mr(MnO2) = 55 + 16*2 =87

W(Mn) = Ar(Mn) * n / Mr(MnO2)  *100% = 55 *1 / 87  *100% =63%

W(O) = Ar(O) *n / Mr(MnO2)  *100% = 16*2 / 87  *100% =37%

Mr(V2O5) = 51*2 + 16*5 = 182

W(V) = Ar(V) *n / Mr(V2O5)  *100% = 51*2 / 182  *100% = 56%

W(O) = Ar(O) *n / Mr(V2O5)  *100% = 16*5 / 182  *100% =44%