Question
Balance the equation.
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E°(Fe3+ | Fe2+)= 0.77V and E°(Br | Br-) = 1.09V
$\text{C}_2\text{H}_4(\text{g})+3\text{O}_2(\text{g})\overrightarrow{\ \ \ \ \ \ \ }\ 2\text{CO}_2(\text{g})+2\text{H}_2\text{O(l)};$ $\Delta\text{H}=-1410\text{kJ mol}^{-1}$
Assuming 70% efficiency, determine how much of useful heat is evolved in the reaction.