Ответ:

Объяснение:

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(NaCl) = 23 + 35,5 = 58,5

W(Na) = Ar(Na) *n / Mr(NaCl)  *100% = 23 *1 / 58,5  *100% =39%

W(Cl) = Ar(Cl) *n / Mr(NaCL)  *100% = 35,5 *1 / 58,5  *100% = 61%

Mr(MgO) = 24+16 = 40

W(Mg) = Ar(Mg) *n / Mr(MgO)  *100% = 24*1 / 40  *100% = 60%

W(O) = Ar(O) *n / Mr(MgO)  *100% = 16*1 / 40  *100% = 40%