If ΔfH∘C2H4 and ΔfH∘C2H6 are x1and x2kcal mol1 , then heat of hydrogenation of C2H4is :

Heat of hydrogenation C2H4=ΔHfC2H6−ΔHfC2H4=x2−x1

If ΔfH∘C2H4 and ΔfH∘C2H6 are x1and x2kcal mol1 , then heat of hydrogenation of C2H4is :

Heat of hydrogenation C2H4=ΔHfC2H6−ΔHfC2H4=x2−x1

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If $Δ_{f} H^{\circ} (C_{2} H_{4})$ and $Δ_{f} H^{\circ} (C_{2} H_{6})$ are $x_{1}$ and $x_{2}$ kcal mol1 , then heat of hydrogenation of $C_{2} H_{4}$ is :

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$x_{1} + x_{2}$

$x_{1} - x_{2}$

$x_{1} + 2 x_{2}$

$x_{2} - x_{1}$

answer is C.

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Heat of hydrogenation $C_{2} H_{4}$
$\begin{array}{l} = Δ H_{f} (C_{2} H_{6}) - Δ H_{f} (C_{2} H_{4}) \\ = x_{2} - x_{1} \end{array}$

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If ΔfH∘C2H4 and ΔfH∘C2H6 are x1and x2kcal mol1 , then heat of hydrogenation of C2H4is :

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If $Δ_{f} H^{\circ} (C_{2} H_{4})$ and $Δ_{f} H^{\circ} (C_{2} H_{6})$ are $x_{1}$ and $x_{2}$ kcal mol1 , then heat of hydrogenation of $C_{2} H_{4}$ is :