Question #20ae1

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Answer 1 · 2015-04-24T18:31:40

To answer any $Delta(X)_(rxn)$ problem; where $X=H^0,S^0, or G^0$ we can always use Hess's Law.

Hess's Law:
$Delta(G^0)_(rxn)=(Sum DeltaG (Products))-(Sum DeltaG(Reactants))$

For our reaction $2CO(g)+O_2(g)->2CO_2(g)$

Notice: You cannot omit the physical state for these problems, this is why I added the (g) and I'm going to assume (g) for all.

$Delta(G^0)_(rxn)=[(2mol CO_2g*-394.4 (kJ)/(mol))] -[(2mol COg*-137.3(kJ)/(mol))+(1mol O_2g*0(kJ)/(mol))]$

Notice: the mol units cancel out leaving our answer in kJ.

$Delta(G^0)_(rxn)=[-788.8kJ]-[-274.6kJ]$

$Delta(G^0)_(rxn)=-514.2kJ$