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  4. If Δ fH° C2 H4 and Δ fH° C2 H6 are x1 and x2Kcal/mol, then heat of hydrogenation of C2H4 is:-

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Q. If $\Delta _{f}H^{\circ} C_{2} H_{4}$ and $\Delta _{f}H^{\circ} C_{2} H_{6}$ are $x_{1}$ and $x_{2}Kcal/mol,$ then heat of hydrogenation of $C_{2}H_{4}$ is:-

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Solution:

$C _2 H _4+ H _2 \rightarrow C _2 H _6 \Delta H _{ rxn }^{\circ}$
$\Delta H _{ rxn }{ }^{\circ}=\Delta H _{ f }{ }^{\circ} C _2 H _6-\Delta H _{ f }{ }^{\circ} C _2 H _4$
$= x _2- x _1$