# Problem: Given these reactions,X(s) +1/2 O2(g) → XO(s)ΔH=-539.5 kJXCO3(s) →  XO(s)+CO2(g)ΔH=+266.3 kJwhat is ΔHrxn for this reaction?X(s)+1/2 O2(g)+CO2(g) → XCO3(s)

###### FREE Expert Solution

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)                                 ΔH=-539.5 kJ

2. XCO3(s)   XO(s)+CO2(g)                             ΔH=+266.3 kJ

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

87% (275 ratings) ###### Problem Details

Given these reactions,

X(s) +1/2 O2(g) → XO(s)

ΔH=-539.5 kJ

XCO3(s) →  XO(s)+CO2(g)

ΔH=+266.3 kJ

what is ΔHrxn for this reaction?

X(s)+1/2 O2(g)+CO2(g) → XCO3(s)

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