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Объяснение:

2Ba + O2 = 2BaO

BaO + H2O = Ba(OH)2

Ba(OH)2 + 2HCl = BaCl2 + 2H2O

BaCl2 + H2SO4 = BaSO4↓ + 2HCl

3BaO + 2Н3PO4 = Ba3(PO4)2↓ + 3H2O

CaSiO3 + t⁰C = CaO + SiO2↓

CaO + H2O = Ca(OH)2

Ca(OH)2 + CO2 = CaCO3 + H2O

CaCO3 = CaO + CO2↑

3CaO + 2Al = 3Ca + Al2O3

X = CaO

Ca(OH)2 + 2HCl = CaCl2 + 2H2O