Ответ:

Объяснение:

1) Mr(CuO) = Ar(Cu) + Ar(O) = 64 + 16 = 80

w(Cu) = Ar(Cu) * n/Mr(CuO) * 100% = 64/80 * 100% = 80%

w(O) = Ar(O) * n/Mr(CuO) * 100% = 16/80 * 100% = 20%

2) Mr(SO2) = Ar(S) + Ar(O) * 2 = 32 + 16 * 2 = 64

w(S) = Ar(S) * n/Mr(SO2) * 100% = 32/64 * 100% = 50%

w(O) = Ar(О) * n/Mr(SO2) * 100% = 16 * 2/80 * 100% = 50%

3)Mr(SO3) = Ar(S) + Ar(O) * 3 = 32 + 16 * 3 = 80

w(S) = Ar(S) * n/Mr(SO3) * 100% = 32/80 * 100% = 40%

w(O) = Ar(О) * n/Mr(SO3) * 100% = 16 * 3/80 * 100% = 60%