Calculate the heat of combustion of eithene
`CH_(2) = CH_(2)(g) + 3O_(2)(g) rarr 2CO_(2)(g) + 2H_(2)O(I)`
The bond energy data are given below
C = C = 619 kJ `mol^(-1)`
C - H = 414 kJ `mol^(-1)`
O = O = 499 kJ `mol^(-1)`
C = O = 724 kJ `mol^(-1)`
O - H = 460 kJ `mol^(-1)`

Explanation

To calculate the heat of combustion of ethene (C2H4), we will use the bond energy values provided. The reaction is as follows:

\[ \text{C}_2\text{H}_4(g) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 2\text{H}_2\text{O}(l) \]

### Step 1: Identify the bonds in the reactants
In the reactants, we have:
- 1 C=C bond in ethene
- 4 C-H bonds in ethene (2 C-H bonds for each carbon)
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