Calculate `Delta_(r ) H^(Θ)` for the reaction : `C_(6)H_(6)(l)+7.5O_(2)(g)rarr 6CO_(2)(g)+3H_(2)O(l)`
Given the standard heat of formations `(Delta_(f)H^(Θ))` of `H_(2)O(l), CO_(2)(g)` and `C_(6)H_(6)(l)` are `-57.80` kcal/mol, `-94.05` kcal/mol and 19.8 kcal/mol respectively.

Explanation

To calculate the standard enthalpy change of the reaction (ΔrH°) for the combustion of benzene, we can use the following formula:

\[ \Delta_r H^\Theta = \sum (\Delta_f H^\Theta \text{ of products}) - \sum (\Delta_f H^\Theta \text{ of reactants}) \]

### Step 1: Identify the reaction and the components
The reaction given is:
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