Question

Given the reactions,

 

X(s)+12O2(g)⟶XO(s)   ΔH=−637.9 kJ

 

XCO3(s)⟶XO(s)+CO2(g)ΔH=+480.9 kJ

 

what is Δ? for this reaction?

 

X(s)+1/2O2(g)+CO2(g)⟶XCO3(s)

 

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