Magniy sulfat, mis (II) sulfat va temir (II) sulfat kristallogidratlar

A) 57,0
B) 64,0

123. (v13-134-12) Magniy sulfat, mis (II) sulfat va temir (II) sulfat kristallogidratlari aralashmasi tarkibida vodorodning massa ulushi 4,5% metallarning massa ulushlari yigindisi 17,5% bolsa, shu aralashmadagi kislorodni massa ulushini (%) aniqlang? A) 57,0 B) 64,0 C) 78,0 D)62,2