Problem: Given these reactions:X(s) +1/2 O2(g) → XO(s)           H= -639.7XCO3(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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We’re being asked to determine the enthalpy change (ΔHrxn) for the chemical reaction:

X (s) + 1/2 O(g) + CO(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. XCO(s)  →  XO (s)+CO(g)   ΔH2  =  349.7

Step 1. We now need to find a combination of reactions that when added up, gives us the overall reaction.

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Problem Details

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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Based on our data, we think this problem is relevant for Professor Broome's class at University of Southern Mississippi.