Ответ:
CaO: Ca(2) O(2)
H2S: H(1) S(2)
Fe2O3: Fe(3) O(2)
Na2O: Na(1) O(2)
NH3: N(3) H(1)
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Ответ:
CaO: Ca(2) O(2)
H2S: H(1) S(2)
Fe2O3: Fe(3) O(2)
Na2O: Na(1) O(2)
NH3: N(3) H(1)