The heats of combustion of `C_(2)H_(4(g)), C_(2)H_(6(g))` and `H_(2(g))` are `-1409.4,-1558.3` and `-285.6 kJ` respectively. Calculate heat of hydrogenation of ethylene.

Explanation

To calculate the heat of hydrogenation of ethylene (C₂H₄), we can use the heats of combustion provided for C₂H₄, C₂H₆, and H₂. The heat of hydrogenation can be determined using the following reaction:

\[ \text{C}_2\text{H}_4(g) + \text{H}_2(g) \rightarrow \text{C}_2\text{H}_6(g) \]

### Step 1: Write the equation for heat of hydrogenation
The heat of hydrogenation (ΔH_hydrogenation) can be calculated using the formula:

\[ \Delta H_{\text{hydrogenation}} = \Delta H_{\text{combustion of products}} - \Delta H_{\text{combustion of reactants}} \]
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