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Question

Given the reactions X(s)+12O2(g)⟶XO(s) Δ𝐻=−909.3 kJ XCO3(s)⟶XO(s)+CO2(g) Δ𝐻=+428.9 kJ what is Δ 𝐻 for this reaction? X(s)+12O2(g)+CO2(g)⟶XCO3(s)