Làm giúp mình bài này với ạ. Mình vote 5sao. Mãi iu <33 Trên 2 đĩa cân A và B , đĩa A đặt cốc đựng dung dịch HCl, đĩa B đặt cốc đựng dung dịch axit sunfuric (H2SO4) Điều chỉnh cho cân về vị trí thăng bằng. Cho vào cốc đựng dung dịch HCl 10 g CaCO3, xảy ra phản ứng theo sơ đồ : CaCO3 + HCl CaCl2 + H2O + CO2 Cân mất thăng bằng. Để cân trở lại vị trí thăng bằng, người ta thêm vào cốc đựng dung dịch H2SO4 a g kim loại kẽm, xảy ra phản ứng theo sơ đồ : Zn + H2SO4 ZnSO4 + H2 a) Viết các phương trình hoá học. b) Tính a. (Biết dung dịch hai axit ở hai cốc được lấy dư).

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