Problem: Given these reactions, X (s) + 1/2O2 (g) → XO (s)     ΔH = -993.7 kJ XCO3 (s) → XO (s) + CO2 (g)     ΔH = +424.5 kJ What is ΔHrxn for this reaction? X (s) + 1/2O2 (g) + CO2 (g) → XCO3 (s) 

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Problem Details

Given these reactions, 

X (s) + 1/2O2 (g) → XO (s)     ΔH = -993.7 kJ 

XCO3 (s) → XO (s) + CO2 (g)     ΔH = +424.5 kJ 

What is ΔHrxn for this reaction? 

X (s) + 1/2O2 (g) + CO2 (g) → XCO3 (s) 

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