October 2018 1 20 Report

Określ liczbę i rodzaj atomów w symbolach pierwiastków i wzorach związków chemicznych:

H₂SO₄, 5 Fe, 2 NaCl, 2 HNO₃, 3 Zn, PbO₂, Co₂, 4 K, 3SO₃, 4 CrO₃,
2 N₂O5


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