We’re being asked to determine the enthalpy change (ΔHrxn) for the chemical reaction:
X (s) + 1/2 O2 (g) + CO2 (g) → XCO3(s)
We can use Hess’s Law to determine the enthalpy change of the overall reaction from the given reactions:
1. X (s) + 1/2 O2(g) → XO (s) ΔH1 = -639.7
2. XCO3 (s) → XO (s)+CO2 (g) ΔH2 = 349.7
Step 1. We now need to find a combination of reactions that when added up, gives us the overall reaction.
Given these reactions:
X(s) +1/2 O2(g) → XO(s) H= -639.7
XCO3(s) → XO(s)+CO2(g) H= +349.7
What is H(rxn) for this reaction?
X(s)+1/2 O2(g)+CO2(g) --> XCO3(s)
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