Calculate the heat of combustion of benzene form the following data:
a. `6C(s) +3H_(2)(g) rarr C_(6)H_(6)(l), DeltaH = 49.0 kJ`
b. `H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.8 kJ`
c. `C(s) +O_(2) (g) rarr CO_(2)(g), DeltaH =- 389.3 kJ`

Explanation

To calculate the heat of combustion of benzene (C₆H₆), we will use Hess's law, which states that the total enthalpy change during a chemical reaction is the sum of the enthalpy changes for the individual steps of the reaction. We will manipulate the given reactions to derive the combustion reaction of benzene.

### Step-by-Step Solution:

1. **Write the combustion reaction of benzene:**
\[ C_6H_6(l) + \frac{15}{2} O_2(g) \rightarrow 6 CO_2(g) + 3 H_2O(l) \]
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