The heat of combustion of $C_{2} H_{4}, C_{2} H_{6}$ and $H_{2}$ gases are -1409.5 KJ, -1558.3 KJ and -285.6 KJ respectively. The heat of hydrogenation of ethene is :

-136.8 kJ

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-13.68 kJ

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273.6 kJ

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1.368 kJ

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Solution

The correct option is C -136.8 kJ
Hydrogenation reaction of ethene: $C_{2} H_{4} + H_{2} \to C_{2} H_{6}$ .

Heat of hydrogenation of ethene = $Δ H_{C_{2} H_{4}} + Δ H_{H_{2}} - Δ H_{C_{2} H_{6}}$ .

Now, the combustion reactions are:

(i) $C_{2} H_{4} + 3 O_{2} \to 2 C O_{2} + 2 H_{2} O; Δ H_{1} = - 1409.5 K J$

(iii) $H_{2} + \frac{1}{2} O_{2} \to H_{2} O; Δ H_{2} = - 285.6 K J$

(ii) $C_{2} H_{6} + \frac{7}{2} O_{2} \to 2 C O_{2} + 3 H_{2} O; Δ H_{3} = - 1558.3 K J$
Now, (i) + (ii) - (iii) gives:

$C_{2} H_{4} + H_{2} \to C_{2} H_{6}$

$Δ H = Δ H_{1} + Δ H_{2} - Δ H_{3}$

$= - 1409.5 - 285.6 - (- 1558.3)$

$= - 136.8$ KJ

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The heat of combustion of C2H4,C2H6 and H2 gases are -1409.5 KJ, -1558.3 KJ and -285.6 KJ respectively. The heat of hydrogenation of ethene is :

The heat of combustion of $C_{2} H_{4}, C_{2} H_{6}$ and $H_{2}$ gases are -1409.5 KJ, -1558.3 KJ and -285.6 KJ respectively. The heat of hydrogenation of ethene is :