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Calculate the standard enthalpy of forma...

Calculate the standard enthalpy of formation of `C_(6)H_(6)(l)` at `25^(@)C` temperature using the given data:
`C_(6)H_(6)(l)+(15)/(2)O_(2)(g) to 6CO_(2)(g)+3H_(2)O(l),DeltaH^(0)=-781kcal`
`H_(2)(g)+(1)/(2)O_(2)(g) to H_(2)O(l),DeltaH^(0)=-68.32kcal`
C (s, graphite)`+O_(2)(g)toCO_(2)(g),DeltaH^(0)=-94.04 kcal`.

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