Ответ: Б. 40%
SO3
Ar(S) = 32
Mr(SO3) = 80
W(S) = (32 : 80) × 100% = 40%
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Ответ: Б. 40%
SO3
Ar(S) = 32
Mr(SO3) = 80
W(S) = (32 : 80) × 100% = 40%