Рассчитайте относительную молекулярную массу веществ (Мr) (3 балла) Мr (О2 )=
Мr (NaCl)=
Мr (P2O5 ) =
Мr (H2CO3 )=
Мr (KNO3) =
Мr (Na2CO3 ) =
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