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Given: C(graphite, s)+O(2)(g)toCO(2)(g),...

Given: C(graphite, s)`+O_(2)(g)toCO_(2)(g),DeltaH^(0)=x_(1)`
C(graphite, s)`+(1)/(2)O_(2)(g) to CO(g),DeltaH^(0)=x_(2)`
`CO(g)+(1)/(2)O_(2)(g) to CO_(2)(g),DeltaH^(0)=x_(3)`
Express `x_(3)` in terms of `x_(1) and x_(2)`.

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`x_(3)=x_(1)-x_(2)`.
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