The heat of formation of ethene, C$_2$H$_4$ is 50 kJmol$^{-1}$, and that of ethane, C$_2$H$_6$ is -82kJmol$^{-1}$. Calculate the heat evolved in the process:

C$_2$H$_4$ + H$_2$ $\to$ C$_2$H$_6$

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