Ответ: б)28,57%
Объяснение:
Mr(CaO) = Ar(Ca) + Ar(O) = 40 + 16 = 56
W(O) = ((Ar(O)/Mr(CaO)) * 100% = (16/56)) * 100% = 0,2857 * 100% = 28,57%
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Ответ: б)28,57%
Объяснение:
Mr(CaO) = Ar(Ca) + Ar(O) = 40 + 16 = 56
W(O) = ((Ar(O)/Mr(CaO)) * 100% = (16/56)) * 100% = 0,2857 * 100% = 28,57%